10-K

Significant Accounting Policies [Text Block]

Summary of Significant Accounting Policies

Principles of Consolidation

The consolidated financial statements include the accounts of IXYS Corporation and our wholly-owned subsidiaries after elimination of all intercompany balances and transactions.

Foreign Currency Translation and Transaction

Use of Estimates

not

limited to, revenue reserves, inventory valuation, deferred income taxes and related valuation allowances, allocation of purchase price in business combinations, valuation of goodwill and identifiable intangible assets and asset impairment analysis.

Revenue Recognition

We sell to distributors and original equipment manufacturers. Revenues from distributors were approximately

58.7%,

56.7%

and

55.6%

in fiscal

2017,

2016

and

2015,

respectively. Accounts receivable from distributors are recognized and inventory is relieved when title to inventories transfers, typically upon shipment from us, at which point we have a legally enforceable right to collection under normal payment terms.

We provide some of our distributors with the following programs: stock rotation and ship and debit. Reserves for sales returns and allowances, including allowances for

“ship and debit” transactions, are recorded at the time of shipment, and are based on historical levels of returns,

current economic trends and changes in customer demand.

Allowance for sales returns.

We maintain an allowance for sales returns based on estimated product returns by our customers. We estimate our allowance for sales returns based on our historical return experience, known returns we have

not

received, current economic trends, changes in customer demand, and other assumptions. If we were to make different judgments or utilize different estimates, the amount and timing of our revenues could be materially different. Given that our revenues consist of a high volume of relatively similar products, to date our actual returns and allowances have

not

fluctuated significantly from period to period and our returns provisions have historically been reasonably accurate. This allowance is included as part of “Accounts receivable, net” on the balance sheet and as a reduction of revenues in the statement of operations.

Allowance for stock rotation.

We also provide “stock rotation” to select distributors. The rotation allows distributors to return a percentage of the previous

six

months’ sales in exchange for orders of an equal or greater amount. In the fiscal years ended

March

31,

2017,

2016

and

2015,

approximately

$1,459,000,

$1,494,000

and

$1,741,000,

respectively, of products were returned to us under the program. We establish the allowance for sales to distributors.

The allowance, which is management’s best estimate of future returns, is based upon the historical experience of returns and inventory levels at the distributors. This allowance is included as part of “Accounts receivable, net” on the balance sheet and as a reduction of revenues in the statement of operations. Should distributors increase stock rotations beyond our estimates, these statements would be adversely affected.

Allowance for ship and debit.

Ship and debit is a program designed to assist distributors in meeting competitive prices in the marketplace on sales to their end-customers. Ship and debit requires a request from the distributor for a pricing adjustment for a specific part for a customer sale to be shipped from the distributor’s stock. We have

obligation to accept this request. However, it is our historical practice to allow some distributors to obtain pricing adjustments for inventory held. We receive periodic statements regarding our products held by our distributors. Ship and debit authorizations

may

cover current and future distributor activity for a specific part for sale to a distributor’s customer. At the time we record sales to distributors, we provide an allowance for the estimated future distributor activity related to such sales since it is probable that such sales to distributors will result in ship and debit activity. The sales allowance requirement is based on sales during the period, credits issued to distributors, distributor inventory levels, historical trends, market conditions, pricing trends we see in our direct sales activity with original equipment manufacturers and other customers, and input from sales, marketing and other key management. We believe that the analysis of these inputs enables us to make reliable estimates of future credits under the ship and debit program. This analysis requires the exercise of significant judgments. Our actual results to date have approximated our estimates. At the time the distributor ships the part from stock, the distributor debits us for the authorized pricing adjustment. This allowance is included as part of “Accounts receivable, net” on the balance sheet and as a reduction of revenues in the statement of operations. If competitive pricing were to decrease sharply and unexpectedly, our estimates might be insufficient, which could significantly adversely affect our operating results.

Additions to the ship and debit allowance are estimates of the amount of expected future ship and debit activity related to sales during the period. Additions to the allowance reduce revenues and gross profit in the period. The following table sets forth the beginning and ending balances of, additions to, and deductions from, our allowance for ship and debit during the

three

years ended

March 31, 2017 (

in thousands):

Balance March 31, 2014	$	1,071
Additions		5,765
Deductions		(5,777	)
Balance March 31, 2015		1,059
Additions		4,479
Deductions		(4,672	)
Balance March 31, 2016		866
Additions		7,363
Deductions		(6,680	)
Balance March 31, 2017	$	1,549

Trade accounts receivable and allowance for doubtful accounts.

Trade accounts receivable are recorded at the invoiced amount and do

not

bear interest. The allowance for doubtful accounts is our best estimate of the amount of probable credit losses in the existing accounts receivable. We determine the allowance based on the aging of our accounts receivable, the financial condition of our customers and their payment history, our historical write-off experience and other assumptions. Past due balances and other specified accounts as necessary are reviewed individually. If the financial condition of our customers were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances

may

be required. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. Actual write-offs

may

be in excess of the recorded allowance. This allowance is reported on the balance sheet as part of “Accounts receivable, net” and is included on the statement of operations as part of selling, general and administrative expenses, or SG&A expenses.

Cash and Cash Equivalents

We consider all highly liquid investments with original maturities of

three

months or less at the time of purchase to be cash equivalents. Cash equivalents include investments in commercial paper and money market accounts at banks.

Restricted Cash

Restricted cash balances at

March 31, 2017

and

March 31, 2016

were

$1.3

million and

$277,000,

respectively. At both dates, restricted cash balances included funds segregated for pension payments in Germany. Restricted cash as of

March 31, 2017

also included a security deposit of

€1.0

million, or approximately

$1.1

million, made in relation to a loan with IKB Deutsche Industriebank, or IKB, during fiscal

2017.

The security deposit will mature on

December

29,

2017

so long as compliance occurs through that date.

Inventories

Inventories are recorded at the lower of standard cost, which approximates actual cost on a

first

-in-

first

-out basis, or market value. Our accounting for inventory costing is based on the applicable expenditure incurred, directly or indirectly, in bringing the inventory to its existing condition. Such expenditures include acquisition costs, production costs and other costs incurred to bring the inventory to its use. As it is impractical to track inventory from the time of purchase to the time of sale for the purpose of specifically identifying inventory cost, our inventory is, therefore, valued based on a standard cost, given that the materials purchased are identical and interchangeable at various production processes. We review our standard costs on an as-needed basis but in any event at least once a year, and update them as appropriate to approximate actual costs. The authoritative guidance provided by Financial Accounting Standards Board, or FASB

, requires certain abnormal expenditures to be recognized as expenses in the current period instead of capitalized in inventory. It also requires that the amount of fixed production overhead allocated to inventory be based on the normal capacity of the production facilities.

may

be required to reduce the valuation of our inventories below cost. We regularly review inventory quantities on hand and record an estimated provision for excess inventory based primarily on our historical sales and expectations for future use. We also recognize a reserve based on known technological obsolescence, when appropriate. Actual demand and market conditions

may

be different from those projected by our management. This could have a material effect on our operating results and financial position. If we were to make different judgments or utilize different estimates, the amount and timing of our write-down of inventories could be materially different.

Excess inventory frequently remains saleable. When excess inventory is sold, it yields a gross profit margin of up to

100%.

Sales of excess inventory have the effect of increasing the gross profit margin beyond that which would otherwise occur, because of previous write-downs. Once we have written down inventory below cost, we do

not

write it up when it is subsequently utilized, sold or scrapped. We do

not

physically segregate excess inventory nor do we assign unique tracking numbers to it in our accounting systems. Consequently, we cannot isolate the sales prices of excess inventory from the sales prices of non-excess inventory. Therefore, we are unable to report the amount of gross profit resulting from the sale of excess inventory or quantify the favorable impact of such gross profit on our gross profit margin.

The following table provides information on our excess and obsolete inventory reserve charged against inventory at cost (in thousands):

Balance at March 31, 2014	$	24,304
Utilization or sale		(1,637	)
Scrap		(2,901	)
Additional provision		4,487
Foreign currency translation adjustments		(1,500	)
Balance at March 31, 2015		22,753
Utilization or sale		(2,455	)
Scrap		(3,217	)
Additional provision		4,125
Foreign currency translation adjustments		174
Balance at March 31, 2016		21,380
Utilization or sale		(3,813	)
Scrap		(3,682	)
Additional provision		5,838
Foreign currency translation adjustments		(425	)
Balance at March 31, 2017	$	19,298

The practical efficiencies of wafer fabrication require the manufacture of semiconductor wafers in minimum lot sizes. Often, when manufactured, we do

not

know whether or when all the semiconductors resulting from a lot of wafers will sell. With more than

10,000

different part numbers for semiconductors, excess inventory resulting from the manufacture of some of those semiconductors will be continual and ordinary. Because the cost of storage is minimal when compared to the potential value and because our products do

not

quickly become obsolete, we expect to hold excess inventory for potential future sale for years. Consequently, we have

set time line for the utilization, sale or scrapping of excess inventory.

March 31, 2017

and

2016,

our lower of cost or market reserves were

$384,000

and

$409,000,

respectively.

Furthermore, we perform an annual inventory count or periodic cycle counts for specific parts that have a high turnover. We also periodically identify any inventory that is

longer usable and write it off.

Property, Plant and Equipment

Property, plant and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over estimated useful lives of

years for equipment and

years to

years for property and plant. Upon disposal, the assets and related accumulated depreciation are removed from our accounts and the resulting gains or losses are reflected in the statements of operations. Repairs and maintenance costs are charged to expense. Depreciation of leasehold improvements is provided on the straight-line method over the shorter of the estimated useful life or the term of the lease.

may

not

be fully recoverable. Impairment is assessed when the forecasted undiscounted cash flows derived for the operation to which the assets relate are less than the carrying amount including associated intangible assets of the operation. If the operation is determined to be unable to recover the carrying amount of its assets, then impairment loss is recognized by reducing the carrying amount of the long-lived asset group on a pro-rata basis using the relative carrying amounts of those assets. Fair value is determined based on discounted cash flows or appraised values, depending on the nature of the assets. Judgment is used when applying these impairment rules to determine the timing of the impairment test, the undiscounted expected cash flows used to assess impairments and the fair value of an impaired asset. The dynamic economic environment in which we operate and the resulting assumptions used to estimate future cash flows affect the outcome of these impairment tests.

Our facility in Lampertheim, Germany serves as collateral for our borrowings from IKB. See Note

“Borrowing Arrangements” for more details.

Treasury Stock

We account for treasury stock using the cost method. Costs include fees charged in connection with acquiring treasury stock.

Other Assets

Other assets include marketable equity securities classified as available-for-sale

, long term equity investments accounted for under the equity method and investments accounted for under the cost method. Investments designated as available-for-sale are reported at fair value with the unrealized gains and losses, net of tax, recorded in other comprehensive income (loss). Realized gains and losses (calculated as proceeds less specifically identified costs) and declines in value of these investments judged by management to be other than temporary, if any, are included in other income (expense), net.

We have a

45%

equity interest in Powersem GmbH, or Powersem, a semiconductor manufacturer based in Germany, and an approximately

20%

equity interest in EB Tech Ltd., or EB Tech, a radiation services provider based in South Korea. In fiscal

2015,

we acquired approximately a

24%

equity interest in Automated Technology, Inc., or ATEC, an assembly and test services provider in the Philippines. These investments are accounted for using the equity method. In fiscal

2017,

we recognized income of

$809,000

on these investments. In fiscal

2016

and

2015,

we recognized losses of

$120,000

and

$7,000

on these investments, respectively.

Investments which do

not

have readily determinable fair values and are

not

required to be accounted for under the equity method are accounted for using the cost method. As of

March 31, 2017,

we have

$3.1

million of cost method investments. We did

not

hold any cost method investments as of

March 31, 2016.

Refer to Note

“Other Assets” and Note

13,

“Related Party Transactions” for further information regarding the investment balances and the related transactions of those long term investments.

Goodwill and Intangible Assets

Goodwill and intangible assets with indefinite lives are reviewed at least annually for impairment charges during the quarter ending

March 31,

or more frequently if events and circumstances indicate that the asset might be impaired, in accordance with the authoritative guidance provided by FASB. We

first

assess qualitative factors to determine whether it is necessary to perform the

two

-step fair value-based impairment test described below. If we believe that, as a result of

the qualitative assessment, it is more likely than

not

that the fair value of a reporting unit is less than its carrying amount, the quantitative impairment test is required. Otherwise,

further testing is required.

Under the quantitative approach effective prior to

January 2017,

there were

two

steps in the determination of the impairment of goodwill. The

first

step compared the carrying amount of the net assets to the fair value of the reporting unit. The

second

step, if necessary, recognized an impairment loss to the extent the carrying value of the reporting unit’s net assets exceeds the implied fair value of goodwill. An impairment loss was recognized to the extent that the carrying amount of goodwill exceeds its implied fair value. In

January 2017,

FASB issued amended guidance which eliminated the

second

step in goodwill impairment testing. Under the new guidance, goodwill impairment is measured as the amount by which a reporting unit’s carrying value exceeds its fair value,

not

to exceed the carrying value of goodwill. The new guidance

longer requires us to determine goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. We adopted the new guidance on a prospective basis commencing with the quarter ended

March 31, 2017.

We operate our business as

one

reporting unit.

We assess the recoverability of the finite-lived intangible assets by examining the occurrences of certain events or changes of circumstances that indicate that the carrying amounts

may

not

be recoverable. After our initial assessment, if it is necessary, we perform the impairment test by determining whether

the estimated undiscounted cash flows attributable to the assets in question are less than their carrying values. Impairment losses, if any, are measured as the amount by which the carrying values of the assets exceed their fair value and are recognized in operating results. If a useful life is determined to be shorter than originally estimated, we accelerate the rate of amortization and amortize the remaining carrying value over the new shorter useful life.

During the quarter ended

December 31, 2016,

based on our assessment, the intangible assets resulting from the RadioPulse acquisition were determined to be fully impaired and an impairment charge of

$1.4

million was recognized. See Note

“Goodwill and Intangible Assets” for further discussion of impairment analysis of goodwill and intangible assets and related charges recorded.

Defined Benefit Plans

“Pension Plans” for further information.

Fair Value of Financial Instruments

valuations.

Advertising Expense

We expense advertising as the costs are incurred. Advertising expense for the years ended

March 31, 2017,

2016

and

2015

was

$411,000,

$433,000

and

$437,000,

respectively. Advertising expense is included in “Selling, general and administrative expenses” on our consolidated statements of operations.

Research and Development Expense

Research and development costs are charged to operations as incurred.

Income Taxes

not

to be realized. In determining the amount of the valuation allowance, we consider income over recent years, estimated future taxable income, feasible tax planning strategies and other factors, in each taxing jurisdiction in which we operate. If we determine that it is more likely than

not

that we will

not

realize all or a portion of our remaining deferred tax assets, we will increase our valuation allowance with a charge to income tax expense. Conversely, if we determine that it is more likely than

not

that we will ultimately be able to utilize all or a portion of the deferred tax assets for which a valuation allowance has been provided, the related portion of the valuation allowance will be released, which will have the effect of reducing income tax expense. Significant management judgment is required in determining the provision for income taxes, the deferred tax assets and liabilities and any valuation allowance recorded against net deferred tax assets. In the event that actual results differ from these estimates or we adjust these estimates in future periods, we

may

need to establish or increase an additional valuation allowance that could materially impact our financial position and results of operations. Our ability to utilize our deferred tax assets and the continuing need for related valuation allowances are monitored on an ongoing basis. See Note

16,

“Income Taxes” for further discussion regarding income taxes.

Other Income (Expense)

Indemnification

Product guarantees and warranties have

not

historically proved to be material. On occasion, we provide limited indemnification to customers against intellectual property infringement claims related to our products. To date, we have

not

experienced significant activity or claims related to such indemnifications. We also provide in the normal course of business indemnification to our officers, directors and selected parties. We are unable to estimate the potential future liability, if any. Therefore,

liability for these indemnification agreements has been recorded as of

March 31, 2017

and

2016.

Legal Contingencies

We are subject to various legal proceedings and claims, the outcomes of which are subject to significant uncertainty. The authoritative guidance provided by FASB requires that an estimated loss from a loss contingency should be accrued by a charge to income if it is probable that an asset has been impaired or a liability has been incurred and the amount of the loss can be reasonably estimated. Disclosure of a contingency is required if there is at least a reasonable possibility that a material loss has been incurred. We evaluate, among other factors, the degree of probability of an unfavorable outcome and the ability to make a reasonable estimate of the amount of loss. Changes in these factors could materially impact our financial position, results of operations or cash flows.

Net Income (Loss) per Share

12,

“Computation of Earnings per Share.”

Accumulated Other Comprehensive Income (Loss)

11,

“Accumulated Other Comprehensive Income (Loss).”

Concentration and Business Risks

Dependence on Third Parties for Wafer Fabrication and Assembly

Measured in dollars, in fiscal

2017

we manufactured approximately

52.6%

of our wafers, an integral component of our products, in our facilities in Germany, the UK, Massachusetts and California. We relied on

third

party suppliers to provide the remaining

47.4%.

There can be

assurance that material disruptions in supply will

not

occur in the future. In such event, we

may

have to identify and secure additional foundry capacity and

may

be unable to identify or secure sufficient foundry capacity to meet demand. Even if such capacity is available from another manufacturer, the qualification process could take

six

months or longer. If we were unable to qualify alternative manufacturing sources for existing or new products in a timely manner or if such sources were unable to produce semiconductor devices with acceptable manufacturing yields and at acceptable prices, our business, financial condition and results of operations would be materially and adversely affected.

Dependence on Suppliers

We purchase silicon substrates from a limited number of vendors, most of whom we do

not

have long term supply agreements with. Any of these suppliers could terminate their relationship with us at any time. Our reliance on a limited number of suppliers involves several risks, including potential inability to obtain an adequate supply of silicon substrates and reduced control over the price, timely delivery, reliability and quality of the silicon substrates. There can be

assurance that problems will

not

occur in the future with suppliers.

Employees Covered by Collective Bargaining Arrangements

Approximately

56.3%

and

94.9%

of our employees in the UK and Germany, respectively, are covered by collective bargaining arrangements.

Concentration of Credit Risk

We invest our excess cash primarily in foreign and domestic banks in short term time deposit and money market accounts. Maturities are generally

three

months or less. Our non-interest bearing domestic cash balances exceed federally insured limits. Additionally, we

may

invest in commercial paper with financial institutions that management believes to be creditworthy. These securities mature within

ninety

days or less and bear minimal credit risk. We have

not

experienced any losses on such investments.

We sell our products primarily to distributors and original equipment manufacturers. We perform ongoing credit evaluations of our customers and generally do

not

require collateral. An allowance for potential credit losses is maintained by us.

See Note

15,

“Segment and Geographic Information” for information related to customers that owe us more than

10%

of our total accounts receivable.

We continually monitor the credit risk in our portfolio and mitigate our credit risk exposures in accordance with the policies approved by our Board of Directors.

Stock-Based Compensation Plans

We have employee equity incentive plans and an employee stock purchase plan, which are described more fully in Note

10,

“Employee Equity Incentive Plans.” The authoritative guidance provided by FASB requires employee stock options and rights to purchase shares under stock participation plans to be accounted for under the fair value method and requires the use of an option pricing model for estimating fair value. Accordingly, share-based compensation is measured at grant date, based on the fair value of the award and shares expected to vest. We use the straight-line attribution method to recognize share-based compensation costs over the service period of the award.

Recent Accounting Pronouncements and Accounting Changes

May 2014,

FASB issued a new standard on the recognition of revenue from contracts with customers, which includes a single set of rules and criteria for revenue recognition to be used across all industries. The revenue standard’s core principle is built on the contract between a vendor and a customer for the provision of goods and services. It attempts to depict the exchange of rights and obligations between the parties in the pattern of revenue recognition based on the consideration to which the vendor is entitled. To accomplish this objective, the standard requires

five

basic steps: identify the contract with the customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract and recognize revenue when or as the entity satisfies a performance obligation. For public companies, this standard is effective for annual reporting periods beginning after

December 15, 2017,

including interim periods during the annual period. Early adoption is permitted for annual periods commencing after

December 15, 2016.

Two different transition methods are available: full retrospective method and a modified retrospective approach.

We do

not

plan to adopt this guidance early. We are currently evaluating the potential impact of this standard on our financial position and results of operations, as well as our selected transition method. Based on our preliminary assessment, we believe the new standard will

not

have a material impact on our financial position and results of operations, as our revenue is primarily generated from the sale of finished products to customers.

Sales predominantly contain a single delivery element and revenue is recognized at a single point in time when ownership, risks, and rewards transfer. We do

not

expect to change the manner or timing of recognizing revenue on a majority of our revenue transactions.

July 2015,

FASB issued an amendment to modify the inventory measurement guidance in Topic

330,

Inventory

, for inventory that is measured using the methods other than last-in,

first

-out, or LIFO, and the retail inventory method. It requires that an entity measure inventory within the scope of this update at the lower of cost and net realizable value. It eliminated the guidance in Topic

330

that required a reporting entity measuring inventory at the lower of cost or market to consider the replacement cost of inventory and the net realizable value of inventory less an approximately normal profit margin along with net realizable value in determining the market value. The guidance will be effective for annual reporting periods beginning after

December 15, 2016,

and interim periods during the annual period. The new standard is required to be applied prospectively with earlier application permitted as of the beginning of an interim or annual reporting period. We do

not

expect this change to have a significant impact on our consolidated financial statements.

January 2016,

FASB issued authoritative guidance that modifies how entities measure equity investments and present changes in the fair value of financial liabilities. Under the new guidance, entities will have to measure equity investments that do

not

result in consolidation and are

not

accounted for under the equity method at fair value and recognize any changes in fair value in net income unless the investments qualify for the new practicality exception. A practicality exception will apply to those equity investments that do

not

have a readily determinable fair value and do

not

qualify for the practical expedient to estimate fair value under Accounting Standards Codification,

Fair Value Measurements

, or ASC

820,

and as such these investments

may

be measured at cost. This guidance is effective for financial statements issued for fiscal years beginning after

December 15, 2017,

and interim periods within those fiscal years. We are currently evaluating the impact of this standard on our consolidated financial statements.

February 2016,

FASB issued amended guidance for lease arrangements, which requires lessees to recognize the following for all leases with terms longer than

months: a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, or ROU asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. The amendment is effective for financial statements issued for fiscal years beginning after

December 15, 2018,

and interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements.

March 2016,

FASB issued amended guidance which simplifies several aspects of the accounting for employee share-based payment awards, including forfeitures, employer tax withholding on share-based compensation and excess tax benefits or deficiencies. The amended guidance also clarifies the statement of cash flows presentation for share-based awards. The guidance is effective for financial statements issued for fiscal years beginning after

December 15, 2016,

and interim periods within those fiscal years. Early adoption is permitted in any interim or annual period for which financial statements have

not

yet been issued or have

not

been made available for issuance. We are currently evaluating the impact of this amended guidance on our consolidated financial statements.

August 2016,

FASB issued amended guidance that provides clarification on cash flow classification related to

eight

specific issues, including debt prepayment or debt extinguishment costs, contingent consideration payments made after a business combination, distributions received from equity method investees and proceeds from the settlement of insurance claims. The guidance will be effective for fiscal years beginning after

December 15, 2017,

including interim reporting periods within those fiscal years. Early adoption is permitted. The amended guidance should be applied retrospectively to all periods presented. If it is impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. We do

not

expect this change to have a significant impact on our consolidated financial statements.

October 2016,

FASB issued amended guidance which requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. This eliminates the current exception for all intra-entity transfers of an asset other than inventory that requires deferral of the tax effects until the asset is sold to a

third

party or otherwise recovered through use. The guidance will be effective for fiscal years beginning after

December 15, 2017,

including interim reporting periods within those annual reporting periods. Early adoption is permitted in the

first

interim period only. The amendments should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We are in the process of evaluating the impacts of the adoption of this amendment.

November 2016,

FASB issued amended guidance which requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and restricted cash. Therefore, restricted cash should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The guidance is effective for fiscal years beginning after

December 15, 2017,

and interim periods within those fiscal years, and is to be applied on a retrospective basis. Early adoption is permitted. We have adopted the guidance on a retrospective basis from the quarter ended

December 31, 2016.

Based on the guidance, the beginning and ending balance of cash and cash equivalents for the respective periods in our audited condensed consolidated statements of cash flow included restricted cash.

January 2017,

FASB issued amended guidance which narrows the existing definition of a business and provides a framework for evaluating whether a transaction should be accounted for as an acquisition (or disposal) of assets or a business. The definition of a business affects areas of accounting such as acquisitions, disposals and goodwill. The revised definition of a business under this guidance is expected to reduce the number of transactions that are accounted for as business combinations. The guidance is effective on a prospective basis for fiscal years beginning after

December 15, 2017,

and interim periods within those fiscal years, with early adoption permitted. The impact on our consolidated financial statements will depend on the facts and circumstances of any specific future transactions

January 2017,

FASB issued amended guidance which eliminates the

second

step in goodwill impairment testing in which

goodwill impairment is determined by calculating the implied fair value of goodwill by hypothetically assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. Under the amended standard, goodwill impairment is measured as the amount by which a reporting unit’s carrying value exceeds its fair value,

not

to exceed the carrying value of goodwill. The guidance is effective on a prospective basis for fiscal years beginning after

December 15, 2019,

and interim periods within those fiscal years.

Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after

January

2017.

We have adopted the guidance on a prospective basis commencing with the quarter ended

March 31, 2017.

The adoption did

not

have any impact on our consolidated financial statements for the quarter ended

March 31, 2017.

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Note 3 - Business Combinations

12 Months Ended

Mar. 31, 2017

Business Combination Disclosure [Text Block]

Business Combinations

RadioPulse, Inc.

May 1, 2015,

we acquired RadioPulse, Inc., or RadioPulse, for a total consideration of

$15.7

million. Based in South Korea, RadioPulse is a fabless semiconductor company that develops, manufactures and sells wireless network technology solutions based on the ZigBee® protocol, which combines microcontrollers and radio frequency devices. RadioPulse’s solutions are designed to enable a broad range of power-sensitive applications in the industrial, medical, consumer, smart grid and Internet of Things, or IoT, markets. RadioPulse offers a product portfolio complementary to our product lines. The consideration included cash consideration paid at closing of

$14.7

million and

$1.0

million related to an adjustment to eliminate debt owed to us for funds advanced prior to closing. The acquisition also included potential earnout payments aggregating up to

$6.0

million based on certain financial thresholds related to net revenues, gross profit and net income in calendar years

2015,

2016

and

2017.

Based on our valuation, the fair value of the liability for the earnout payment at the acquisition date was estimated to be

nil.

The fair value of the liability for the earnout payment has

not

changed since the initial valuation. In connection with the acquisition, we incurred and expensed

$248,000

in legal and consulting costs and

$249,000

in acquisition-related compensation costs during fiscal

2016.

The following table summarizes the values of the assets acquired and liabilities assumed at the acquisition date (in thousands):

	Purchase Consideration Allocation
Cash and cash equivalents and restricted cash	$	196
Accounts receivable		1,497
Inventories		534
Property, plant and equipment		24
Prepaid expenses and other current assets		547
Identifiable intangible assets		2,867
Short-term borrowings		(2,354	)
Accounts payable		(614	)
Accruals and other liabilities		(1,926	)
Total identifiable net liabilities		771
Goodwill		14,887
Total purchase consideration	$	15,658

Identified intangible assets resulting from the RadioPulse acquisition consisted of the following (in thousands):

			Amortization	Estimated
	Fair Value		Method	Useful Life
	(In thousands)			(In months)
Developed intellectual property	$	1,005	Accelerated		60
In-process research and development expenses (1)		1,188	Straight-line		60
Customer relationships		500	Accelerated		36
Contract backlog		174	Straight-line		6
Total	$	2,867

(

) Amortization started in the quarter ended

December 31, 2016

upon the completion of the research and development activities of the corresponding projects.

The value reflected in the table represents the purchase price allocation. The valuation of the acquired intangibles was classified as a level

measurement under the fair value measurement guidance because the valuation was based on significant unobservable inputs and involved management judgment and assumptions about market participants and pricing. We did

not

recognize any liability with respect to the contingent consideration based upon our analysis.

not

deductible for tax purposes.

During the quarter ended

December 31, 2016,

the intangible assets resulting from the RadioPulse acquisition were determined to be fully impaired and an impairment charge of

$1.4

million was recognized. See Note

“Goodwill and Intangible Assets” for further discussion of the impairment analysis of goodwill and intangible assets and the related charges recorded.

RadioPulse contributed net revenues of

$4.1

million, from the date of purchase,

May 1, 2015

to our consolidated statements of operations for the fiscal year ended

March 31, 2016.

The net loss of RadioPulse included in our operating results for the year ended

March 31, 2016

was

$3.6

million, based on the purchase consideration valuation. The results of operations and financial position of RadioPulse were immaterial compared to our financial statements and therefore pro-forma financial statements have

not

been separately presented.

Other Acquisition

In the quarter ended

June 30, 2014,

we completed a business acquisition for a cash consideration of

$2.3

million, net of cash acquired of approximately

$204,000.

The acquisition resulted in a goodwill of

$2.8

million and we assumed debt of

$723,000.

March 31, 2017,

this goodwill balance reflected a cumulative reduction of

$605,000

caused by changes in the foreign exchange translation rate. This acquisition was

not

significant to our consolidated financial statements.

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Note 4 - Fair Value

12 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Text Block]

Fair Value

We account for certain assets and liabilities at fair value. In determining fair value, we consider its principal or most advantageous market and the assumptions that market participants would use when pricing, such as inherent risk, restrictions on sale and risk of non-performance. The fair value hierarchy is based upon the observability of inputs used in valuation techniques. Observable inputs (highest level) reflect market data obtained from independent sources, while unobservable inputs (lowest level) reflect internally developed market assumptions. The fair value measurements are classified under the following hierarchy:

Level

— Quoted prices for identical instruments in active markets.

Level

— Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are

not

active; and model-derived valuations in which all significant inputs or significant value-drivers are observable in active markets.

Level

— Model-derived valuations in which

one

or more significant inputs or significant value-drivers are unobservable.

Fair Value Measurements on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis, excluding accrued interest components, consisted of the following types of instruments as of

March 31, 2017

and

2016

(in thousands):

	March 31, 2017 (1)						March 31, 2016 (1)
			Fair Value Measured at						Fair Value Measured at
			Reporting Date Using						Reporting Date Using
Description	Total		Level 1		Level 2		Total		Level 1		Level 2
Money market funds (2)	$	90,752	$	90,752	$	-	$	115,974	$	115,974	$	-
Marketable equity securities (3)		1,771		1,771		-		1,749		1,749		-
Auction rate preferred securities (3)		350		-		350		350		-		350
Total assets measured at fair value	$	92,873	$	92,523	$	350	$	118,073	$	117,723	$	350

(

)

We did

not

have any recurring fair value measurements of assets or liabilities whose fair value was measured using significant unobservable inputs.

(

)

Included in "Cash and cash equivalents" on our audited consolidated balance sheets.

(

)

Included in "Other assets" on our audited consolidated balance sheets.

We measure our marketable equity securities and derivative contracts at fair value. Marketable equity securities are valued using the quoted market prices and are therefore classified as Level

estimates. All of the marketable equity securities are subject to a periodic impairment review. We review any impairment to determine whether it is other than temporarily impaired. This review is based on factors such as length of time of impairment, extent to which the fair value is below the cost basis, financial conditions of the issuer of the security, our expectations of future recoveries and our ability and intent to hold or sell the securities. Based on our review, we recognized other than temporary impairment losses of

$151,000,

$454,000

and

$1.9

million in marketable equity securities during fiscal

2017,

2016

and

2015,

respectively. See Note

“Other Assets” for further information on the unrealized losses included in marketable securities.

not

to designate these instruments as accounting hedges. The changes in the fair value of these instruments are recorded in the current period’s statement of operations and are included in other income (expense), net. All of our derivative instruments are traded on over-the-counter markets where quoted market prices are

not

readily available. For those derivatives, we measure fair value using prices obtained from the counterparties with whom we have traded. The counterparties price the derivatives based on models that use primarily market observable inputs, such as yield curves and option volatilities. Accordingly, we classify these derivatives as Level

We held

derivative instruments at

March 31, 2017

and

March 31, 2016.

estimates.

$77.8

million and

$87.1

million at

March 31, 2017

and

March 31, 2016,

respectively.

impairment losses on the investments accounted for under the equity method or the cost method were recognized as of

March 31, 2017,

as there have

not

been any events or changes in circumstances that we believe would have had a significant adverse effect on the fair value of those investments.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

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Note 5 - Other Assets

12 Months Ended

Mar. 31, 2017

Other Assets Disclosure [Text Block]

Other Assets

Other assets consisted of the following (in thousands):

	March 31,
	2017		2016
Marketable equity securities	$	1,771	$	1,749
Auction rate preferred securities		350		350
Long-term equity method investments		11,589		10,977
Other items, including cost method investments		4,265		686
Total	$	17,975	$	13,762

Available-for-Sale Investments

March 31, 2017

and include an unrealized loss, net of tax benefits, of

$219,000

March 31, 2017,

and an unrealized loss, net of tax benefits, of

$82,000

March 31, 2016.

See Note

“Fair Value” for further information on the fair value measurements and other than temporary impairment losses recognized.

Available-for-sale investments as of

March 31, 2017

and

2016

were as follows (in thousands):

	Fiscal Year 2017									Fiscal Year 2016
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value		Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value

Marketable equity securities	$	2,116	$	254	$	(599	)	$	1,771	$	1,875	$	46	$	(172	)	$	1,749
Auction rate preferred securities	$	350	$	-	$	-		$	350	$	350	$	-	$	-		$	350

The available-for-sale investments that were in a continuous unrealized loss position as of

March 31, 2017

and

March 31, 2016,

aggregated by length of time that individual securities have been in a continuous loss position, were as follows (in thousands):

	Less than 12 Months				12 Months or Greater				Total
Period	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
March 31, 2017	$	552	$	469	$	47	$	263	$	599	$	732
March 31, 2016	$	29	$	581	$	143	$	932	$	172	$	1,513

Gross unrealized losses on our available-for-sale portfolio were immaterial to the consolidated balance sheets at

March 31, 2017

and

March 31, 2016.

During fiscal

2017,

we recognized a gain of approximately

$201,000

on the sale of available-for-sale investment securities. In respect of those securities, there was an unrealized loss of

$28,000

included in accumulated other comprehensive income as of

March 31, 2016.

Equity Method Investments

As of

March 31, 2017,

we recorded an immaterial amount of our proportionate share of the affiliates’ gains and losses under the equity method of accounting.

The carrying values of our investments in Powersem, EB Tech and ATEC at

March 31, 2017

were

$2.5

million,

$2.6

million and

$6.5

million, respectively. The carrying values of our investments in Powersem, EB Tech and ATEC at

March 31, 2016

were

$2.5

million,

$2.7

million and

$5.7

million, respectively.

We acquired approximately

24%

of the outstanding common shares of ATEC for a purchase price of

$5.9

million on

December 12, 2014.

The investment was initially recorded at cost. Subsequent periodic adjustments to cost are made to record our share in the operating results of ATEC, cash contributions and distributions and the differences between the fair value and carrying cost of assets acquired and liabilities assumed. In fiscal

2017,

we recognized gain of

$765,000

on our investment in ATEC. In fiscal

2016

and

2015,

we recognized losses of

$9,000

and

$140,000,

respectively, on our investment in ATEC.

See Note

“Summary of Significant Accounting Policies” and Note

13,

“Related Party Transactions” for further information on these investments.

Cost Method Investments

During fiscal

2017,

we made investments in privately-held companies. Those investments are accounted for under the cost method as they do

not

qualify for the fair value or another accounting method. At

March 31, 2017,

the carrying value of those investments was

$3.1

million. We do

not

estimate the fair value of those cost method investments because determining the fair value is

not

practicable.

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Note 6 - Balance Sheet Details

12 Months Ended

Mar. 31, 2017

Supplemental Balance Sheet Disclosures [Text Block]

Balance Sheet Details

Accounts Receivable

Accounts receivable consisted of the following (in thousands):

	March 31,
	2017			2016
Accounts receivable, gross	$	45,856		$	41,219
Allowances		(4,689	)		(2,779	)
Accounts receivable, net	$	41,167		$	38,440

Allowances Movement (in thousands):

	Balance at Beginning of Year		Additions		Utilization			Translation Adjustments			Balance at End of Year
Allowances for accounts receivable and for doubtful accounts:
Year ended March 31, 2017	$	2,779	$	10,608	$	(8,657	)	$	(41	)	$	4,689
Year ended March 31, 2016	$	2,768	$	6,795	$	(6,799	)	$	15		$	2,779
Year ended March 31, 2015	$	3,013	$	8,935	$	(9,004	)	$	(176	)	$	2,768

Inventories

Inventories consisted of the following (in thousands):

	March 31,
	2017		2016
Raw materials	$	17,920	$	18,269
Work in process		45,634		41,549
Finished goods		25,882		29,786
Total	$	89,436	$	89,604

Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):

	March 31,
	2017			2016
Property and plant (useful life of 24 years to 50 years)	$	38,195		$	35,290
Equipment owned (useful life of 2 to 8 years)		137,105			139,318
Leasehold improvements (useful life of up to 40 years)		1,064			1,304
Property, plant and equipment, gross		176,364			175,912
Accumulated depreciation		(134,124	)		(133,289	)
Property, plant and equipment, net	$	42,240		$	42,623

Depreciation expense for fiscal years ended

March 31, 2017,

2016

and

2015

amounted to

$7.5

million,

$8.4

million

and

$11.3

million, respectively.

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	March 31,
	2017		2016

Uninvoiced goods and services	$	12,703	$	8,824
Compensation and benefits		6,707		7,540
Income taxes		3,521		2,066
Commissions, royalties and other		2,416		2,860
Total	$	25,347	$	21,290

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Note 7 - Goodwill and Intangible Assets

12 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Text Block]

Goodwill and Intangible Assets

Goodwill

Goodwill represents the excess of the purchase price over the estimated fair value of the net assets acquired in connection with our acquisitions. In

May 2015,

we acquired RadioPulse and recorded

$14.9

million in goodwill. The goodwill balance as of

March 31, 2017

and

2016

reflected changes in the foreign exchange translation rate.

The changes in the carrying amount of goodwill for the years ended

March 31, 2017

and

2016

were as follows (in thousands):

	March 31,
	2017			2016
Goodwill	$	56,024		$	41,137
Accumulated impairment losses		(13,192	)		(13,192	)
Accumulated currency translation adjustment		(477	)		(570	)
Net goodwill at beginning of year		42,355			27,375
Goodwill acquired in acquisition		-			14,887
Currency translation adjustment		(128	)		93
Net goodwill at end of year	$	42,227		$	42,355

The accumulated impairment losses as of

March 31, 2017

and

March 31, 2016

were

$13.2

million.

Identifiable Intangible Assets

Identified intangible assets consisted of the following as of

March 31, 2017 (

in thousands):

	Gross Intangible Assets		Accumulated Impairment		Accumulated Amortization		Net Intangible Assets
Developed intellectual property	$	17,309	$	265	$	14,168	$	2,876
Customer relationships		13,520		123		13,397		-
In-process intellectual property		1,188		1,003		185		-
Contract backlog		7,329		-		7,329		-
Other intangible assets		1,591		-		1,483		108
Total identifiable intangible assets	$	40,937	$	1,391	$	36,562	$	2,984

Identified intangible assets consisted of the following as of

March 31, 2016 (

in thousands):

	Gross Intangible Assets		Accumulated Impairment		Accumulated Amortization		Net Intangible Assets
Developed intellectual property	$	17,309	$	-	$	11,639	$	5,670
Customer relationships		13,520		-		12,961		559
In-process intellectual property		1,188		-		-		1,188
Contract backlog		7,329		-		7,329		-
Other intangible assets		1,599		-		1,409		190
Total identifiable intangible assets	$	40,945	$	-	$	33,338	$	7,607

We review our intangible assets for impairment whenever events and circumstances indicate that the carrying value of an asset might

not

be recoverable, based upon estimated undiscounted future cash flows. When we are required to determine the fair value of intangible assets other than goodwill, we use the income approach. We start with a forecast of all the expected net cash flows associated with the asset and then we apply an asset-specific discount rate to arrive at a net present value amount. Some of the more significant estimates and assumptions inherent in this approach include: the amount and timing of the projected net cash flows on the projections and the selection of a long-term growth rate and the discount rate. Based on our review, the intangible assets resulting from the RadioPulse acquisition were determined to be fully impaired and an impairment charge of

$1.4

million was recognized during the quarter ended

December 31, 2016.

The following table summarizes the components of the acquired identifiable intangible assets associated with the acquisitions of RadioPulse and a

-bit and

-bit microcontroller product line, or the Acquired MCU Business, in fiscal

2014

			Amortization	Estimated
	Fair Value		Method	Useful Life
	(In thousands)			(In months)

RadioPulse:
Developed intellectual property	$	1,005	Accelerated		60
Customer relationships		500	Accelerated		36
In-process research and development expense		1,188	Straight-line		60
Contract backlog		174	Straight-line		6
Total for RadioPulse	$	2,867

Acquired MCU Business:
Developed intellectual property	$	11,504	Straight-line		60
Customer relationships		6,920	Accelerated		36
Contract backlog		5,155	Straight-line		9
Trade name		421	Straight-line		60
Total for Acquired MCU Business	$	24,000

For fiscal

2017,

2016

and

2015,

amortization expenses on acquisition-related intangible assets were

$3.1

million,

$5.6

million and

$6.0

million, respectively. The amortization of intangible assets is expected to be approximately

$2.4

million and

$596,000

in fiscal

2018

and

2019,

respectively.

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

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Note 8 - Borrowing Arrangements

12 Months Ended

Mar. 31, 2017

Debt Disclosure [Text Block]

Borrowing Arrangements

Revolving Credit Agreement

November 20, 2015,

we entered into a Revolving Credit Agreement with a syndicate of banks for a line of credit of

$125.0

million. The agent for the banks is Bank of the West.

The obligations are guaranteed by

four

of our subsidiaries.

The loan is collateralized pursuant to a Contingent Collateral Agreement, under which the assets of the parent company and the

four

subsidiaries could be subject to security interests for the benefit of the banks in the event of a loan default.

The credit agreement provides different interest rate alternatives under which we

may

borrow funds. We

may

elect to borrow based on LIBOR plus a margin or an alternative base rate plus a margin. The margin can range from

0.75%

2.5%,

depending on interest rate alternatives and on our leverage of liabilities to effective tangible net worth. An unused commitment fee is also payable. It ranges from

0.25%

0.625%,

depending on leverage. The applicable interest rate was

2.85%

as of

March 31, 2017.

March 31, 2016

we complied with these financial covenants, except the leverage ratio. The banks waived a default under the Revolving Credit Agreement caused by the leverage ratio, which compared total funded indebtedness as of

March 31, 2016

to EBITDA for the

four

fiscal quarters ended

March 31, 2016.

The leverage ratio minimally exceeded the contractually agreed ratio of

2:1.

The waiver by the banks was a

one

-time waiver and was

not

deemed to be an amendment, waiver, consent, release or modification of any other term or condition of the Revolving Credit Agreement.

December 2016,

we entered into an amendment to the Revolving Credit Agreement with the lenders under which the contractual term of the revolving loan was extended to

November 20, 2019

The leverage ratio was increased to

2.50

1.00

from

2.00

1.00.

other terms of the Revolving Credit Agreement were affected by the amendment. At

March 31, 2017,

we complied with all of the financial covenants.

In relation to the execution of the amendment to the Revolving Credit Agreement, we incurred loan costs of

$281,000

that were deferred and reduced our “Long term loans, net of current portion” on our audited consolidated balance sheets. Those costs, together with the unamortized loan costs of the Revolving Credit Agreement entered on

November 20, 2015

are being amortized over the new life of the credit agreement. The unamortized balance at

March 31, 2017

and

March 31, 2016

was

$399,000

and

$304,000,

respectively.

March 31, 2017

and

March 31, 2016,

the outstanding principal balances under the credit agreement were

$72.6

million and

$80.0

million, respectively.

The Revolving Credit Agreement also includes a

$10.0

million letter of credit subfacility. Borrowing under this subfacility is limited to the extent of availability under the

$125.0

million revolving line of credit.

IKB Deutsche Industriebank

April 2015,

we entered into a loan with IKB. Under the agreement, we borrowed

€6.5

million, or about

$7.2

million at the time. The loan has a term ending

March 31, 2022

and bears a fixed annual interest rate of

1.75%.

Each fiscal quarter, a principal payment of

€232,000,

or about

$248,000,

and a payment of accrued interest are required. Financial covenants for a ratio of indebtedness to cash flow, a ratio of equity to total assets and a minimum stockholders’ equity for the German subsidiary must be satisfied for the loan to remain in good standing. Compliance with these covenants is required annually at

March 31.

We complied with all of these financial covenants at

March 31, 2017.

The loan

may

be prepaid in whole or in part with a modest penalty. The loan is also collateralized by a security interest in the facility in Lampertheim, Germany, and a security deposit of

€1.0

million. The security deposit will mature on

December 29, 2017,

so long as compliance occurs through that date. At

March 31, 2017,

the outstanding principal balance was

€4.6

million, or

$5.0

million at that time.

Loans Assumed from Business Acquisitions

Our outstanding balances

relating to loans assumed upon

business acquisitions at

March 31, 2017

and

March 31, 2016

were

$288,000

and

$1.1

million, respectively.

Aggregate Debt Maturities

Aggregate debt maturities at

March

31,

2017

were as follows (in thousands):

Fiscal Year Payable	Amount
2018	$	1,058
2019		1,047
2020		73,648
2021		1,048
2022		1,048
Thereafter		-
Total		77,849
Less: current portion		1,058
Long-term portion (1)	$	76,791

(

) Includes approximately

$399,000

of unamortized debt issuance cost.

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Note 9 - Pension Plans

12 Months Ended

Mar. 31, 2017

Pension and Other Postretirement Benefits Disclosure [Text Block]

Pension Plans

We maintain

three

defined benefit pension plans:

one

for the UK employees,

one

for German employees, and

one

for Philippine employees. We deposit funds for the UK and Philippine plans with financial institutions and make payments to former German employees directly. We accrue for the unfunded portion of the obligations. The measurement date for projected benefit obligations and plan assets is

March 31.

The UK and German plans have been curtailed. As such, the plans are closed to new entrants and

credit is provided for additional periods of service.

Net Period Pension Cost

The net periodic pension expense includes the following components (in thousands):

	Year Ended March 31,
	2017			2016			2015
Service cost	$	109		$	101		$	104
Interest cost on projected benefit obligation		1,313			1,450			1,803
Expected return on plan assets		(1,183	)		(1,721	)		(1,910	)
Recognized actuarial loss		387			438			179
Net periodic pension expense	$	626		$	268		$	176

Net Amount Recognized (in thousands)

	Year Ended March 31,
	2017			2016
Change in projected benefit obligation:
Projected benefit obligation at the beginning of the year	$	45,021		$	47,346
Service cost		109			101
Interest cost		1,313			1,450
Actuarial (gain) loss		3,356			(1,549	)
Benefits paid		(1,543	)		(1,830	)
Foreign currency adjustment		(5,073	)		(497	)
Projected benefit obligation at year end	$	43,183		$	45,021

Change in plan assets:
Fair value of plan assets at the beginning of the year	$	28,714		$	30,114
Actual return (loss) on plan assets		3,526			(156	)
Employer contribution		993			1,009
Benefits paid from assets		(1,083	)		(1,388	)
Foreign currency adjustment		(3,868	)		(865	)
Plan assets at fair value at year end	$	28,282		$	28,714
Unfunded status of the plan at year end	$	14,901		$	16,307

Pension liability recognized on the balance sheet due after one year	$	14,901		$	16,307

Plans with projected benefit obligation and accumulated benefit obligation in excess of plan assets:
Projected benefit obligation at year end	$	43,183		$	45,021
Accumulated benefit obligation at year end	$	42,652		$	44,509
Plan assets at fair value at year end	$	28,282		$	28,714

Amounts recognized in accumulated other comprehensive income (loss):
Unrecognized actuarial loss, before tax	$	(11,457	)	$	(12,140	)
Amount recognized as component of stockholders’ equity – pretax	$	(11,457	)	$	(12,140	)
Accumulated benefit obligation at year end	$	42,652		$	44,509

Weighted average actuarial assumptions used to determine benefit obligations for the plans were as follows:

	Year End March 31,
	2017				2016
Discount rate		1.9	-	5.2%		1.9	-	4.6%
Expected long term rate of return on assets		3.8	-	6.0%		4.4	-	7.0%
Salary scale			5.0%				5.0%

Information on Plan Assets

We report and measure the plan assets of our defined benefit pension plans at fair value. The table below sets forth the fair value of our plan assets as of

March 31, 2017

and

2016,

using the same

three

-level hierarchy of fair-value inputs described in Note

“Fair Value” (in thousands):

	March 31, 2017						March 31, 2016
Description	Level 1		Level 2		Total		Level 1		Level 2		Total
Cash and cash funds	$	136	$	-	$	136	$	121	$	-	$	121
Equity		314		-		314		351		-		351
Fixed interest		1,203		58		1,261		1,225		96		1,321
Mutual funds		13,181		13,390		26,571		13,527		13,394		26,921
Total	$	14,834	$	13,448	$	28,282	$	15,224	$	13,490	$	28,714

The amount of accumulated other comprehensive income expected to be recognized in net periodic pension cost in fiscal

2018

includes amortization of actuarial loss of

$397,000.

Approximately

73%

of the accrued pension liability relates to the German plan and

25%

to the UK plan. The accrued pension liability related to the Philippine plan is immaterial.

not

include direct holdings of our securities. The investment managers have discretion to vary the balance of investments of the scheme according to prevailing investment conditions and the trustees regularly monitor all investment decisions affecting the scheme and the overall investment performance. At

March 31, 2017,

approximately

50%

of the assets of the UK fund were invested in a diversified growth fund, which

may

invest in securities, collective investment schemes, money market instruments and cash and deposits, while

50%

were in debt securities. The investments in debt securities are made in government index-linked bonds and investment grade corporate bonds. The target allocation of the UK plan assets that we control is

50%

diversified growth fund and

50%

debt securities.

The German plan was held by a separate legal entity. As of

March 31, 2017,

the German defined benefit plan was completely unfunded and we accrued for its obligations.

March 31, 2017,

approximately

75%

of the assets of the fund were invested in fixed income securities,

19%

in equity securities and

in cash. The target allocation for the Philippine fund was

75%

to fixed income securities,

20%

to equities and

to cash and cash equivalents.

We expect to make contributions to the plans of approximately

$948,000

in the fiscal year ending

March 31, 2018.

This contribution is primary contractual.

We expect to pay benefits in each of the next

five

fiscal years and in the aggregate for the

five

fiscal years thereafter of approximately the following (in thousands):

Fiscal Year Ended:	Benefit Payment
March 31, 2018	$	1,525
March 31, 2019		1,561
March 31, 2020		1,632
March 31, 2021		1,660
March 31, 2022		1,611
Five fiscal years ended March 31, 2027		9,449
Total benefit payments for the ten fiscal years ended March 31, 2027	$	17,438

XML 32 R19.htm IDEA: XBRL DOCUMENT

Note 10 - Employee Equity Incentive Plans

12 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

10.

Employee Equity Incentive Plans

Stock Purchase and Stock Option Plans

The

2009

Equity Incentive Plan, the

2011

Equity Incentive Plan, the

2013

Equity Incentive Plan and the

2016

Equity Incentive Plan

September 10, 2009,

our stockholders approved the

2009

Equity Incentive Plan, or the

2009

Plan, under which

900,000

shares of our common stock were reserved for the grant of stock options and other equity incentives. On

September 16, 2011,

our stockholders approved the

2011

Equity Incentive Plan, or the

2011

Plan, under which

600,000

shares of our common stock were reserved for the grant of stock options and other equity incentives. On

August 30, 2013,

our stockholders approved the

2013

Equity Incentive Plan, or the

2013

Plan, under which

2,000,000

shares of our common stock were reserved for the grant of stock options and other equity incentives. On

August 26, 2016,

our stockholders approved the

2016

Equity Incentive Plan, or the

2016

Plan, under which

2,000,000

shares of the common stock were reserved for the grant of stock options and other equity incentives. The

2009

Plan, the

2011

Plan, the

2013

Plan and the

2016

Plan are referred to as the Plans.

Stock Options

Under the Plans, nonqualified and incentive stock options

may

be granted to employees, consultants and non-employee directors. Generally, the per share exercise price shall

not

be less than

100%

of the fair market value of a share on the grant date. The Board of Directors has the full power to determine the provisions of each option issued under the Plans. While we

may

grant options that become exercisable at different times or within different periods, we have primarily granted options that vest over

four

years. The options, once granted, expire

ten

years from the date of grant.

Stock Awards

Stock awards, denominated restricted stock under the

2009

Plan and the

2011

Plan,

may

be granted to any employee, director or consultant under the Plans. Pursuant to a stock award, we will issue shares of common stock. Shares that are subject to the restriction will be released from restriction if certain requirements, including continued performance of services, are met.

Stock Appreciation Rights

Awards of stock appreciation rights, or SARs,

may

be granted to employees, consultants and non-employee directors pursuant to the Plans. A SAR is payable on the difference between the market price at the time of exercise and the exercise price at the date of grant. In any event, the exercise price of a SAR shall

not

be less than

100%

of the fair market value of a share on the grant date and shall expire

later than

ten

years from the grant date. Upon exercise, the holder of a SAR shall be entitled to receive payment either in cash or a number of shares by dividing such cash amount by the fair market value of a share on the exercise date.

Restricted Stock Units

Restricted stock units, denominated performance units in the

2009

Plan,

may

be granted to employees, consultants and non-employee directors under the Plan. Each restricted stock unit shall have a value equal to the fair market value of

one

share. After the applicable performance period has ended, the holder will be entitled to receive a payment, either in cash or in the form of shares, based on the number of restricted stock units earned over the performance period, to be determined as a function of the extent to which the corresponding performance goals or other vesting provisions have been achieved.

The

1999

Equity Incentive Plan

Prior to

May 2009,

stock options were granted under the

1999

Equity Incentive Plan, or the

1999

Plan, for

not

less than

85%

of fair market value at the time of grant. Once granted, the options expire

ten

years from the date of grant. Options granted to employees under the

1999

Equity Incentive Plan typically vested over

four

years. The

1999

Plan expired in

May 2009

and

additional grants

may

be made thereunder.

Zilog

2004

Omnibus Stock Incentive Plan

The Zilog

2004

Omnibus Stock Incentive Plan, or the Zilog

2004

Plan, was approved by the stockholders of Zilog in

2004,

and was amended and approved by the stockholders of Zilog in

2007.

In connection with the acquisition of Zilog, our Board of Directors approved assumption of the Zilog

2004

Plan. Employees of Zilog and persons

first

employed by our company after the closing of the acquisition of Zilog were eligible to receive grants under the Zilog

2004

Plan. Under the

2004

Plan, non-statutory stock options were granted. At the time of the assumption of the Zilog

2004

Plan by our company, up to

652,963

shares of our common stock were available for grant under the plan.

In general, the options and shares granted pursuant to the Zilog

2004

Plan are exercisable at such time or times, and subject to such terms and conditions (including the vesting schedule, period of exercisability and expiration date) as the plan administrator, generally the Compensation Committee of our Board of Directors, determined in the applicable option agreement. The exercise price per share, payable upon the exercise of an option, was established by such administrator at the time of the grant and is

not

less than the par value per share of common stock on the date of the grant and, in the case of an incentive stock option, generally is

not

less than

100%

of the fair market value per share on the date of grant. The Zilog

2004

Plan expired in

February 2014

and

additional grants

may

be made thereunder.

Zilog

2002

Omnibus Stock Incentive Plan

The Zilog

2002

Omnibus Stock Incentive Plan, or the Zilog

2002

Plan, was adopted in

2002.

In connection with the acquisition of Zilog, our Board of Directors approved the assumption of the Zilog

2002

Plan with respect to the shares available for grant as stock options. Employees of Zilog and persons

first

employed by our company after the closing of the acquisition of Zilog were eligible to receive grants under the Zilog

2002

Plan. At the time of the assumption of the Zilog

2002

Plan by our company, up to

366,589

shares of our common stock were available for grant under the plan.

Stock options granted under the Zilog

2002

Plan were permitted to be: (i) incentive stock options or nonqualified stock options or (ii) EBITDA-linked options and/or non-EBITDA linked options. We did

not

grant any EBITDA-linked options and

none

are outstanding. In general, non-EBITDA-linked options granted pursuant to the Zilog

2002

Plan was exercisable at such time or times and subject to such terms and conditions (including the vesting schedule, period of exercisability and expiration date) as determined by the plan administrator in the applicable award agreements or thereafter. The exercise price per share payable upon the exercise of an option was established by such administrator at the time of grant. The term of each non-EBITDA-linked option was determined at the time of grant and does

not

exceed

ten

years. The Zilog

2002

Plan expired in

May 2012

and

additional grants

may

be made thereunder.

Employee Stock Purchase Plan

The Board of Directors has approved the Amended and Restated

1999

Employee Stock Purchase Plan, or the Purchase Plan, and reserved a total of

1,550,000

shares of common stock for issuance under the Purchase Plan. Under the Purchase Plan, all eligible employees

may

purchase our common stock at a price equal to

85%

of the lower of the fair market value at the beginning of the offer period or the semi-annual purchase date. Stock purchases are limited to

15%

of an employee’s eligible compensation. During the year ended

March 31, 2017,

there were

112,171

shares purchased under the Purchase Plan, leaving approximately

128,070

shares available for purchase under the Purchase Plan in the future.

Fair Value of Stock Compensation

	Year Ended March 31,
Statement of Operations Classifications	2017		2016		2015

Cost of goods sold	$	362	$	488	$	433
Research, development and engineering (1)		1,144		1,272		814
Selling, general and administrative		1,932		1,832		1,620
Stock-based compensation effect in income before income tax provision		3,438		3,592		2,867
Provision for income tax		694		660		1,009
Net stock-based compensation effects on net income	$	2,744	$	2,932	$	1,858

(

) Includes acquisition-related compensation expenses of

$249,000

during fiscal

2016.

As of

March 31, 2017,

there were approximately

$6.8

million of total unrecognized compensation costs related to stock options granted. The unrecognized compensation cost is expected to be recognized over a weighted average period of

2.6

years.

during fiscal

2017,

2016

and

2015,

were based on estimates at the date of grant as follows:

	Stock Options									Purchase Plan
	Year Ended March 31,									Year Ended March 31,
	2017			2016			2015			2017			2016			2015
Weighted average estimated fair value of grant per share	$	4.48		$	4.83		$	5.54		$	3.28		$	3.33		$	2.90
Risk-free interest rate		1.6	%		1.8	%		1.8	%		0.4	%		0.1	%		0.1	%
Expected term in years		6.41			6.45			6.25			0.75			0.50			0.50
Volatility		40.6	%		44.9	%		52.2	%		37.5	%		39.8	%		36.9	%
Dividend yield		0.4	%		1.2	%		1.0	%		0.7	%		1.1	%		1.1	%

zero

-coupon issues with remaining terms similar to the expected term of the options.

We recognize the estimated compensation cost of restricted stock over the vesting term. The estimated compensation cost is based on the fair value of our common stock on the date of grant.

not

grant any bonus shares during fiscal

2017.

Stock compensation activities under our equity incentive plans for fiscal 2017, 2016 and 2015 were as follows:

				Options Outstanding
	Shares Available for Grant			Number of Shares (1)			Intrinsic Value (2)		Weighted Average Exercise Price per Share
								(000)

Balances, March 31, 2014		1,930,250			5,201,635		$	8,658	$	10.22
Options granted		(249,000	)		249,000				$	11.83
Options exercised		-			(339,374	)	$	1,310	$	8.62
Options cancelled		39,750			(94,250	)			$	11.46
Options expired		26,000			(74,500	)			$	11.17
Balances, March 31, 2015		1,747,000			4,942,511		$	10,831	$	10.37
Options granted		(1,124,000	)		1,124,000				$	11.72
Options exercised		-			(382,826	)	$	1,551	$	9.02
Options cancelled		14,500			(14,500	)			$	11.31
Options expired		-			(434,788	)			$	14.68
Balances, March 31, 2016		637,500			5,234,397		$	6,456	$	10.40
New shares authorized (3)		2,000,000
Options granted		(746,000	)		746,000				$	11.06
Options exercised		-			(859,852	)	$	3,112	$	9.10
Options cancelled		7,500			(7,500	)			$	13.37
Options expired		22,500			(27,500	)			$	11.81
Balances, March 31, 2017		1,921,500			5,085,545		$	19,570	$	10.70

(

)

The number of stock options exercised includes shares that were withheld on behalf of employees to satisfy the statutory tax withholding requirements.

(

)

Except for options exercised, these amounts represent the difference between the exercise price and

$14.55

per share, the closing price of our stock on

March 31, 2017

as reported on the NASDAQ Global Select Market, for all in-the-money, outstanding and exercisable options.

(

)

August 26, 2016,

our stockholders approved the

2016

Plan, under which

2,000,000

shares of our common stock are reserved for the grant of stock options and other equity incentives.

The following table summarizes information about stock options outstanding at

March 31, 2017:

Options Outstanding										Options Exercisable
Exercise Price per Share				Number of Shares Outstanding		Weighted Average Contractual Life		Weighted Average Exercise Price per Share		Number of Shares Exercisable		Weighted Average Exercise Price per Share
$	5.01	-	7.75		576,500		1.6	$	6.66		576,500	$	6.66
$	7.76	-	10.00		843,295		4.7	$	9.30		783,545	$	9.30
$	10.01	-	12.50		2,890,750		6.9	$	11.31		1,417,000	$	11.51
$	12.51	-	14.50		775,000		5.4	$	12.95		523,250	$	12.78
$	5.01	-	14.50		5,085,545		5.7	$	10.70		3,300,295	$	10.34

Of the

5,085,545

options outstanding,

3,300,295

were exercisable on

March 31, 2017

at a weighted average exercise price of

$10.34

per share, with an intrinsic value of

$13.9

million. The weighted average remaining contractual life of options outstanding and options exercisable at

March 31, 2017

was

5.7

years and

4.1

years, respectively. The fair value of options that vested during the year ended

March 31, 2017

was

$2.9

million.

The following table summarizes information about stock options outstanding at

March 31, 2016:

Options Outstanding										Options Exercisable
Exercise Price per Share				Number of Shares Outstanding		Weighted Average Contractual Life		Weighted Average Exercise Price per Share		Number of Shares Exercisable		Weighted Average Exercise Price per Share
$	5.01	-	7.75		819,897		2.6	$	6.63		819,897	$	6.63
$	7.76	-	10.00		1,223,500		4.8	$	9.33		1,017,750	$	9.29
$	10.01	-	12.50		2,448,000		6.6	$	11.42		1,331,916	$	11.52
$	12.51	-	13.37		743,000		6.1	$	12.96		450,000	$	12.69
$	5.01	-	13.37		5,234,397		5.5	$	10.40		3,619,563	$	9.93

Of the

5,234,397

options outstanding,

3,619,563

were exercisable on

March 31, 2016

at a weighted average exercise price of

$9.93

per share, with an intrinsic value of

$6.0

million. The weighted average remaining contractual life of options outstanding and options exercisable at

March 31, 2016

was

5.5

years and

years, respectively. The fair value of options that vested during the year ended

March 31, 2016

was

$2.8

million.

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Note 11 - Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Mar. 31, 2017

Comprehensive Income (Loss) Note [Text Block]

11.

Accumulated Other Comprehensive Income (Loss)

The components and the changes in accumulated other comprehensive income (loss), net of income taxes, were as follows (in

thousands):

	Foreign Currency			Unrealized Gains (Losses) on Securities			Defined Benefit Pension Plans			Accumulated Other Comprehensive (Loss)
Balance as of March 31, 2014	$	10,535		$	325		$	(5,831	)	$	5,029
Other comprehensive income (loss) before reclassifications		(24,112	)		(1,536	)		(3,830	)		(29,478	)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)		-			1,218			143			1,361
Net current period other comprehensive income (loss)		(24,112	)		(318	)		(3,687	)		(28,117	)
Balance as of March 31, 2015		(13,577	)		7			(9,518	)		(23,088	)
Other comprehensive income (loss) before reclassifications		2,938			(362	)		(71	)		2,505
Net gain (loss) reclassified from accumulated other comprehensive income (loss)		-			273			44			317
Net current period other comprehensive income (loss)		2,938			(89	)		(27	)		2,822
Balance as of March 31, 2016		(10,639	)		(82	)		(9,545	)		(20,266	)
Other comprehensive income (loss) before reclassifications		(8,594	)		(106	)		196			(8,504	)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)		-			(31	)		256			225
Net current period other comprehensive income (loss)		(8,594	)		(137	)		452			(8,279	)
Balance as of March 31, 2017	$	(19,233	)	$	(219	)	$	(9,093	)	$	(28,545	)

The amounts reclassified out of accumulated other comprehensive income (loss) for the fiscal year

2017,

2016

and

2015

were as follows (in thousands):

Accumulated Other Comprehensive Income (Loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)									Impacted Line Item on Consolidated Statements of Operations
	Year Ended March 31,
	2017			2016			2015

Net gain (loss) on investments	$	201		$	(1	)	$	30		Other income (expense), net
Impairment of marketable securities		(151	)		(454	)		(1,903	)	Other income (expense), net
Recognized actuarial loss		(387	)		(437	)		(179	)	Cost of goods sold
Subtotal		(337	)		(892	)		(2,052	)	Income before income tax provision
Tax impact		112			575			691		Provision for income tax
Total reclassifications for the year	$	(225	)	$	(317	)	$	(1,361	)	Net income

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Note 12 - Computation of Earnings Per Share

12 Months Ended

Mar. 31, 2017

Earnings Per Share [Text Block]

12.

Computation of Earnings per Share

Basic and diluted earnings per share were calculated as follows (in thousands, except per share amounts):

	Year Ended March 31,
	2017		2016		2015
Net income	$	21,348	$	14,741	$	23,740
Weighted average shares - basic		31,544		31,579		31,531
Weighted average shares - diluted		32,248		32,381		32,239
Net income per share - basic	$	0.68	$	0.47	$	0.75
Net income per share - diluted	$	0.66	$	0.46	$	0.74

Diluted weighted average shares included approximately

704,000,

802,000

and

708,000

common equivalent shares from stock options for fiscal

2017,

2016

and

2015,

respectively.

Basic net income available per common share is computed using net income and the weighted average number of common shares outstanding

during the period. Diluted net income per common share is computed using net income and the weighted average number of common shares outstanding, assuming dilution, which includes potentially dilutive common shares outstanding during the period. Potentially dilutive common shares include the assumed exercise of stock options using the treasury stock method. In fiscal

2017,

2016

and

2015,

there were outstanding options to purchase

2,945,238,

1,943,420

and

2,357,772

shares, respectively, at weighted average exercise prices of

$11.79,

$12.02

and

$12.24

per share, respectively, that were

not

included in the computation of diluted net income per share since the exercise prices of the options exceeded the market price of the common stock and thus their inclusion would be anti-dilutive. These options could dilute earnings per share in future periods if the market price of the common stock increases.

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Note 13 - Related Party Transactions	12 Months Ended
Note 13 - Related Party Transactions	Mar. 31, 2017
Notes to Financial Statements
Related Party Transactions Disclosure [Text Block]	13. Related Party Transactions We own 45% of the outstanding equity of Powersem, a module manufacturer based in Germany. The investment is accounted for using the equity method. In fiscal 2017, 2016 and 2015, we recorded revenues of $1.6 million, $1.5 million and $1.8 million, respectively, from sales of products to Powersem for use as components in their products. In fiscal 2017, 2016 and 2015, we purchased $3.9 million, $3.4 million and $4.0 million, respectively, of products from Powersem. At March 31, 2017 and 2016, the accounts receivable balances from our sales to Powersem were $96,000 and $99,000, respectively. The accounts payable balances to Powersem, as of March 31, 2017 and 2016, were $72,000 and $63,000, respectively. The carrying values at March 31, 2017 and March 31, 2016 were $2.5 million. We own approximately 20% of the outstanding equity of EB Tech Ltd., a company with expertise in radiation technology based in South Korea. The investment is accounted for using the equity method. In fiscal 2017, 2016 and 2015, EB Tech rendered processing services totaling approximately $347,000, $378,000 and $278,000, respectively, to our company. As of March 31, 2017 and 2016, our accounts payable balances to EB Tech were $35,000 and $26,000, respectively. The carrying values at March 31, 2017 and at March 31, 2016 were $2.6 million and $2.7 million, respectively. On December 12, 2014, we acquired approximately 24% of the outstanding common shares of ATEC, a supplier located in the Philippines that provides assembly and test services. The investment is accounted for by the equity method. In fiscal 2017 and 2016, ATEC rendered assembly and test services totaling approximately $7.8 million and $8.0 million t o our company, respectively. As of March 31, 2017 and 2016, the accounts payable balances to ATEC were $996,000 and $737,000, respectively . The carrying values at March 31, 2017 and at March 31, 2016 were $6.5 million and $5.7 million, respectively. We had no other material related party transactions with companies in which we invested and which were accounted for by the equity method during fiscal 2017.

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Note 14 - Employee Savings and Retirement Plans	12 Months Ended
Note 14 - Employee Savings and Retirement Plans	Mar. 31, 2017
Notes to Financial Statements
Postemployment Benefits Disclosure [Text Block]	14. Employee Savings and Retirement Plans We have a 401 (k) plan, known as the “IXYS Corporation and Subsidiary Employee Savings and Retirement Plan.” Eligibility to participate in the plan is subject to certain minimum service requirements. Employees may voluntarily contribute up to the limit prescribed by law and we may make matching contributions in our discretion. Employees are 100% vested immediately in any contributions by us. For the years ended March 31, 2017, 2016 and 2015, we contributed $606,000, $616,000 and $615,000, respectively. IXYS UK also has a defined contribution plan, known as “Westcode Semiconductor Group Personal Pension.” The plan is subject to minimum service requirements. Employees contribute up to 4.5% of the pensionable salary. IXYS UK contributes up to 7% depending upon the contribution by the employee. Additionally, IXYS UK pays the annual management charges for the plan. Employees are 100% vested immediately in any contributions by IXYS UK. For the years ended March 31, 2017, 2016 and 2015, IXYS UK contributed $241,000, $278,000 and $287,000, respectively.

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Note 15 - Segment and Geographic Information

12 Months Ended

Mar. 31, 2017

Segment Reporting Disclosure [Text Block]

15.

Segment and Geographic Information

We have a single operating segment and reportable segment. We design, develop, manufacture and market high performance semiconductor products. Our

two

Chief Executive Officers,

one

of whom is also the Chief Financial Officer, have been identified as the chief operating decision makers. Our chief operating decision makers review financial information presented as

one

operating segment for the purpose of making decisions, allocating resources and assessing financial performance.

Our net revenues by major geographic area (based on destination) were as follows (in thousands):

	Year Ended March 31,
	2017		2016		2015
United States	$	81,499	$	75,994	$	85,314
Europe and the Middle East:
Austria		2,313		1,836		2,290
Finland		2,178		1,899		1,669
France		9,553		9,076		7,917
Germany		37,919		33,215		32,866
Hungary		1,942		2,082		2,571
Italy		4,091		4,328		4,645
Netherlands		4,488		3,608		2,315
Russia		1,263		4,773		5,051
Sweden		1,694		2,155		4,460
Switzerland		2,311		2,789		2,569
Turkey		1,929		2,376		2,658
United Kingdom		14,042		13,502		19,832
Other		10,097		10,700		11,259
Asia Pacific:
China		84,447		79,575		83,597
Indonesia		2,160		2,128		3,224
Japan		6,995		9,271		8,469
Malaysia		4,692		4,662		5,580
Singapore		13,509		12,353		11,694
South Korea		19,282		23,215		22,371
Taiwan		2,051		3,151		2,688
Thailand		3,547		3,904		4,300
Other		1,557		1,929		1,148
Rest of the World:
India		4,315		4,293		5,163
Other		4,249		4,395		5,117
Total	$	322,123	$	317,209	$	338,767

The following table sets forth net revenues for each of our product groups during fiscal

2017,

2016

and

2015

(in thousands):

	Year Ended March 31,
	2017		2016		2015
Power semiconductors	$	221,312	$	213,347	$	219,445
Integrated circuits		82,067		84,078		95,547
Systems and RF power semiconductors		18,744		19,784		23,775
Total	$	322,123	$	317,209	$	338,767

Revenue from significant customers, those representing

10%

or more of total revenue for the respective periods, is summarized as follows:

	Year Ended March 31,
	2017			2016			2015
Revenues:
Distributor A		12.3	%		12.2	%		10.2	%
Distributor B		10.8	%		less than 10	%		10.5	%

Accounts receivable from significant customers, those representing

10%

or more of accounts receivable for the respective dates, is summarized as follows:

	March 31,
	2017			2016
Accounts Receivable:
Distributor A		15.2	%		18.2	%
Distributor C		10.5	%		less than 10	%

	Year Ended March 31,
	2017		2016		2015
Net revenues:
Foreign	$	148,159	$	159,984	$	188,964
Domestic		173,964		157,225		149,803
Total	$	322,123	$	317,209	$	338,767

Net income:
Foreign	$	17,172	$	11,039	$	21,379
Domestic		4,176		3,702		2,361
Total	$	21,348	$	14,741	$	23,740

	March 31,
	2017		2016		2015
Property, plant and equipment, net:
United States	$	25,284	$	26,792	$	27,740
Germany		15,594		14,506		13,228
Other countries		1,362		1,325		1,577
Total property, plant and equipment, net	$	42,240	$	42,623	$	42,545

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Note 16 - Income Taxes

12 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Text Block]

16.

Income Taxes

In fiscal

2017,

the provision for income taxes had an effective tax rate of

26%

as compared to

37%

in fiscal

2016

and

22%

in fiscal

2015.

The fiscal

2017

and

2015

tax rates reflected higher income generated in certain foreign jurisdictions with lower taxes rates. The higher tax rate in fiscal

2016

was caused by an out-of-period adjustment of

of pretax income and the recording of valuation allowances for net operating losses generated in foreign jurisdictions.

Income before income tax consisted of the following (in thousands):

	Year Ended March 31,
	2017		2016		2015
Domestic	$	7,997	$	9,030	$	3,390
International		20,903		14,459		27,040
Total	$	28,900	$	23,489	$	30,430

Our provision for income taxes consisted of the following (in thousands):

	Year Ended March 31,
	2017			2016		2015
Current:
Federal	$	406		$	1,418	$	201
State		(560	)		126		83
Foreign		4,532			3,436		5,066
Total current		4,378			4,980		5,350

Deferred:
Federal		1,867			3,554		945
State		1,256			189		20
Foreign		51			25		375
Total deferred		3,174			3,768		1,340
Total provision for income tax	$	7,552		$	8,748	$	6,690

The reconciliation of our effective tax rate to the U.S. statutory federal income tax rate was as follows:

	Year Ended March 31,
	2017			2016			2015
	(%)			(%)			(%)
Statutory federal income tax rate		35			35			35
State taxes, net of federal tax benefit		1			1			1
Expense (benefit) of lower-tax foreign jurisdictions		(17	)		(10	)		(15	)
Tax credits		(2	)		(3	)		(1	)
Valuation allowances		4			3			-
Permanent items		-			(5	)		-
Tax reserves		1			-			-
Tax asset write-off		2			10			-
Foreign income		2			6			2
Effective tax provision rate		26			37			22

The significant components of net deferred income tax assets were as follows (in thousands):

	March 31,
	2017			2016
Deferred tax assets:
Reserves and allowances	$	5,504		$	6,018
Other liabilities and accruals		6,297			6,176
Depreciable assets		404			83
Net operating loss carryforwards		10,236			11,675
Share-based compensation		4,721			5,098
Credits carryforward		2,188			2,440
Total deferred tax assets		29,350			31,490
Less: Valuation allowances and other reserves		(4,611	)		(3,466	)
Net deferred tax assets	$	24,739		$	28,024

2017,

we recorded certain adjustments on valuation allowances, tax contingency reserves and other temporary items. The impact of these adjustments is discussed further in this note.

Under the Tax Reform Act of

1986,

the amounts of and benefits from net operating loss carryforwards and tax credit carryforwards

may

be impaired or limited in certain circumstances. Events that

may

restrict utilization of net operating loss and credit carryforwards include, but are

not

limited to, certain ownership change limitations and continuity of business requirements, as defined in Internal Revenue Code Section

382

and similar state provisions. Current utilization of carryforwards is restricted by an annual limitation, which results in the expiration of net operating loss carryforwards and credit carryforwards before they can be utilized.

In aggregate, the valuation allowances in fiscal

2017

increased by

$1.1

million as compared to fiscal

2016,

while it decreased by

$436,000

in fiscal

2016

when compared to fiscal

2015.

The increase in valuation allowances in fiscal

2017

primarily related to recoverability of certain research and development tax credits as well as an increase in net operating loss in a foreign jurisdiction.

March 31, 2017,

we had U.S. net operating loss carryforwards of approximately

$23.4

million, all of which are subject to the limitations under Section

382

of the U.S. tax code resulting from a change in ownership. These carryforwards will expire, if

not

utilized, from fiscal

2018

2023

for U.S. tax purposes.

None

of the U.S. net operating loss carryforwards include stock option deductions arising from our equity incentive plans. As of

March 31, 2017

we had net operating loss carryforwards for foreign income tax purposes of approximately

$18.6

million offset by a corresponding valuation allowance of

$16.4

million.

At the end of fiscal

2017,

we had

$6.4

million of gross unrecognizable tax benefits, all of which would affect our effective tax rate if recognized. The

$6.4

million has been classified under “Other long term liabilities” on our consolidated balance sheet. Our liability decreased by

$503,000

from the prior year, primarily due to the expiration of statutes of limitation. We do

not

anticipate any unrecognizable tax benefits in the next

months that would result in a material change to our financial position.

We include interest and penalties in the financial statements as a component of income tax expense. We had

$952,000

of accrued interest and penalties at

March

31,

2017,

which included

$94,000

of interest and penalties reversed for the year ended

March 31, 2017,

net of

$438,000

of interest and penalties accrued and

$532,000

of interest and penalties reversed.

The aggregate changes in the balance of gross unrecognizable tax benefits were as follows (in thousands):

Balance as of March 31, 2014	$	6,978
Lapse of statute of limitations		(3,070	)
Increases in balances related to tax positions taken during prior periods		213
Increases in balances related to tax positions taken during the current period		2,831
Balance as of March 31, 2015		6,952
Lapse of statute of limitations		(772	)
Increases in balances related to tax positions taken during prior periods		129
Increases in balances related to tax positions taken during the current period		637
Balance as of March 31, 2016		6,946
Lapse of statute of limitations		(1,461	)
Decreases in balances related to tax positions taken during prior periods		(63	)
Increases in balances related to tax positions taken during the current period		1,021
Balance as of March 31, 2017	$	6,443

$3.0

million at

March 31, 2017.

March 31, 2016

our valuation allowances included uncertain tax positions relating to the realizability of net operating losses at certain foreign jurisdictions of

$4.1

million.

As of

March 31, 2017,

U.S. income taxes were

not

provided for on a cumulative total of approximately

$150.5

million of undistributed earnings for certain foreign subsidiaries. The cash and cash equivalents balance of our foreign subsidiaries at

March 31, 2017

was approximately

$74.0

million. We intend to reinvest these earnings indefinitely in operations outside of the U.S. If these earnings were distributed to the U.S. in the form of dividends or otherwise, or if the shares of the relevant foreign subsidiaries were sold or otherwise transferred, we would be subject to additional U.S. income taxes (subject to an adjustment for foreign tax credits) and foreign withholding taxes. Determination of the amount of unrecognizable deferred income tax liability related to these earnings is

not

practicable.

2002

and forward by virtue of the tax attributes carrying forward from those years. We also remain subject to examination in most jurisdictions for all years since

2010.

The Protecting Americans from Tax Hikes Act of

2015,

or the Act, was signed into law on

December 18, 2015.

The Act contains a number of provisions including, most notably, a permanent extension of the U.S. federal research tax credit. The Company’s tax provision for fiscal

2017

reflects the benefit of the U.S. federal research credit.

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Note 17 - Commitments and Contingencies

12 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Text Block]

17.

Commitments and Contingencies

Commitments

We rent certain of our facilities under operating leases expiring through fiscal

2022.

Future operating leases and commitments for the purchase of inventory and property and equipment were as follows (in thousands):

Fiscal Year Ended March 31,	Operating Leases		Other Purchase Obligations
2018	$	1,350	$	23,700
2019		1,209		2,776
2020		1,087		-
2021		667		-
2022		473		-
Total minimum payments	$	4,786	$	26,476

Rent expense for fiscal years ended

March 31, 2017,

2016

and

2015

amounted to

$1.5

million,

$1.6

million and

$1.4

million, respectively.

As of

March 31, 2017

and

2016,

we had cash deposits with financial institutions of

$1.3

million and

$277,000,

respectively, which were restricted as to use and represent funds segregated for pension payments in Germany. These balances are included in restricted cash on our audited consolidated balance sheets.

Revolving Credit Agreement

See Note

“Borrowing Arrangements” for information regarding the terms of the credit agreement.

Legal Proceedings

April 17, 2017,

North Plate Semiconductor, LLC, or NPS, filed an action for patent infringement against us in the United States District Court for the Eastern District of Michigan, alleging that certain of our IGBTs and power MOSFETs sold in the United States infringe U.S. patents owned by NPS. NPS accused us of infringing the following U.S. patents:

6,617,641;

6,620,653;

6,667,515;

6,717,210;

6,765,239

and

6,936,893.

NPS’s complaint sought unspecified damages, but

not

less than a reasonable royalty on our products that NPS accused of infringement. In its complaint, NPS contended that our alleged infringement of NPS’s patents had been and continued to be willful and sought trebled damages.

There can be

assurance of a favorable outcome in the NPS suit. Although we believe that we have meritorious defenses to the claims of infringement set forth in NPS’s complaint, in the event of an adverse outcome, damages awarded by the U.S. District Court could be materially adverse to our financial condition, results of operations or cash flows.

We are also involved in a variety of other legal matters that arise in the normal course of business. Based on information currently available, management does

not

believe that the ultimate resolution of these matters will have a material adverse effect on our financial condition, results of operations and cash flows. Were an unfavorable ruling to occur, there exists the possibility of a material adverse impact on the results of operations of the period in which the ruling occurs.

Other Commitments and Contingencies

We have ongoing income tax audits of our subsidiary in the Philippines for the fiscal years ended

March 31, 2010

and

2011.

The Philippine Bureau of Internal Revenue, or BIR, has made an assessment for a deficiency of income taxes, inclusive of interest and penalties, of approximately

$2.5

million and

$156,000,

respectively, for the fiscal years

2010

and

2011.

We are vigorously contesting the assessments of both years. While there are

assurances that we will prevail, we believe that we have valid legal reasons to challenge the BIR’s decision and that our appeals will merit a favorable resolution. Accordingly, we have

not

accrued any amount for this matter.

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Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Mar. 31, 2017

Quarterly Financial Information [Text Block]

Selected Quarterly Financial Data (unaudited, in thousands, except per share amounts)

The following table sets forth a summary of our unaudited quarterly operating results for each of the last

eight

quarters in the period ended

March 31, 2017.

We have derived this data from our unaudited consolidated interim financial statements that, in our opinion, have been prepared on substantially the same basis as the audited financial statements contained elsewhere in this report and include all normal recurring adjustments necessary for a fair presentation of the financial information for the periods presented. These unaudited quarterly results should be read in conjunction with our financial statements and notes thereto included elsewhere in this report. The operating results in any quarter are

not

necessarily indicative of the results that

may

be expected for any future period.

Fiscal Year Ended

March 31, 2017

	Three Months Ended
	March 31, 2017		December 31, 2016		September 30, 2016		June 30, 2016
Net revenues	$	83,372	$	79,484	$	78,629	$	80,638
Gross profit		29,194		26,939		25,455		23,994
Operating income		9,233		7,819		6,771		5,029
Net income	$	9,294	$	5,100	$	3,935	$	3,019

Net income per share:
Basic (1)	$	0.29	$	0.16	$	0.12	$	0.10
Diluted (1)	$	0.28	$	0.16	$	0.12	$	0.09
Weighted average shares used in per share calculation:
Basic		31,724		31,558		31,490		31,401
Diluted		32,635		32,209		32,145		32,001

Fiscal Year Ended

March 31, 2016

	Three Months Ended
	March 31, 2016		December 31, 2015		September 30, 2015		June 30, 2015
Net revenues	$	79,772	$	75,133	$	80,257	$	82,047
Gross profit		24,115		24,029		26,012		25,602
Operating income		6,834		6,262		7,033		5,704
Net income (2)	$	6,197	$	2,286	$	3,273	$	2,985

Net income per share:
Basic (1)	$	0.20	$	0.07	$	0.10	$	0.09
Diluted (1)	$	0.19	$	0.07	$	0.10	$	0.09
Weighted average shares used in per share calculation:
Basic		31,441		31,487		31,651		31,746
Diluted		32,076		32,343		32,380		32,733

(

)

The sum of the

four

quarterly calculations of net income per share is

not

equal to the annual net income per share

due to the use of quarterly weighted average shares used to determine the quarterly net income per share as compared to the annual weighted average shares used to determine the annual net income per share.

(

)

During the fiscal year ended

March 31, 2016,

we recorded out-of-period adjustments that increased the income tax provision

by a net amount of

$1.4

million. See Note

16,

"Income Taxes" in the Notes to Consolidated Financial Statements in Item

of this Annual Report on Form

-K for further discussion of an out-of-period adjustment during the quarter ended

December 31, 2015.

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Significant Accounting Policies (Policies)

12 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

Principles of Consolidation

The consolidated financial statements include the accounts of IXYS Corporation and our wholly-owned subsidiaries after elimination of all intercompany balances and transactions.

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency Translation and Transaction

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

not

Revenue Recognition, Policy [Policy Text Block]

Revenue Recognition

We sell to distributors and original equipment manufacturers. Revenues from distributors were approximately

58.7%,

56.7%

and

55.6%

in fiscal

2017,

2016

and

2015,

We provide some of our distributors with the following programs: stock rotation and ship and debit. Reserves for sales returns and allowances, including allowances for

“ship and debit” transactions, are recorded at the time of shipment, and are based on historical levels of returns,

current economic trends and changes in customer demand.

Allowance for sales returns.

not

Allowance for stock rotation.

We also provide “stock rotation” to select distributors. The rotation allows distributors to return a percentage of the previous

six

months’ sales in exchange for orders of an equal or greater amount. In the fiscal years ended

March

31,

2017,

2016

and

2015,

approximately

$1,459,000,

$1,494,000

and

$1,741,000,

respectively, of products were returned to us under the program. We establish the allowance for sales to distributors.

Allowance for ship and debit.

may

Additions to the ship and debit allowance are estimates of the amount of expected future ship and debit activity related to sales during the period. Additions to the allowance reduce revenues and gross profit in the period. The following table sets forth the beginning and ending balances of, additions to, and deductions from, our allowance for ship and debit during the

three

years ended

March 31, 2017 (

in thousands):

Balance March 31, 2014	$	1,071
Additions		5,765
Deductions		(5,777	)
Balance March 31, 2015		1,059
Additions		4,479
Deductions		(4,672	)
Balance March 31, 2016		866
Additions		7,363
Deductions		(6,680	)
Balance March 31, 2017	$	1,549

Trade accounts receivable and allowance for doubtful accounts.

Trade accounts receivable are recorded at the invoiced amount and do

not

may

be required. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. Actual write-offs

may

Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and Cash Equivalents

We consider all highly liquid investments with original maturities of

three

months or less at the time of purchase to be cash equivalents. Cash equivalents include investments in commercial paper and money market accounts at banks.

Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]

Restricted Cash

Restricted cash balances at

March 31, 2017

and

March 31, 2016

were

$1.3

million and

$277,000,

respectively. At both dates, restricted cash balances included funds segregated for pension payments in Germany. Restricted cash as of

March 31, 2017

also included a security deposit of

€1.0

million, or approximately

$1.1

million, made in relation to a loan with IKB Deutsche Industriebank, or IKB, during fiscal

2017.

The security deposit will mature on

December

29,

2017,

so long as compliance occurs through that date.

Inventory, Policy [Policy Text Block]

Inventories

Inventories are recorded at the lower of standard cost, which approximates actual cost on a

first

-in-

first

may

Excess inventory frequently remains saleable. When excess inventory is sold, it yields a gross profit margin of up to

100%.

not

write it up when it is subsequently utilized, sold or scrapped. We do

not

The following table provides information on our excess and obsolete inventory reserve charged against inventory at cost (in thousands):

Balance at March 31, 2014	$	24,304
Utilization or sale		(1,637	)
Scrap		(2,901	)
Additional provision		4,487
Foreign currency translation adjustments		(1,500	)
Balance at March 31, 2015		22,753
Utilization or sale		(2,455	)
Scrap		(3,217	)
Additional provision		4,125
Foreign currency translation adjustments		174
Balance at March 31, 2016		21,380
Utilization or sale		(3,813	)
Scrap		(3,682	)
Additional provision		5,838
Foreign currency translation adjustments		(425	)
Balance at March 31, 2017	$	19,298

The practical efficiencies of wafer fabrication require the manufacture of semiconductor wafers in minimum lot sizes. Often, when manufactured, we do

not

know whether or when all the semiconductors resulting from a lot of wafers will sell. With more than

10,000

not

quickly become obsolete, we expect to hold excess inventory for potential future sale for years. Consequently, we have

set time line for the utilization, sale or scrapping of excess inventory.

March 31, 2017

and

2016,

our lower of cost or market reserves were

$384,000

and

$409,000,

respectively.

Furthermore, we perform an annual inventory count or periodic cycle counts for specific parts that have a high turnover. We also periodically identify any inventory that is

longer usable and write it off.

Property, Plant and Equipment, Policy [Policy Text Block]

Property, Plant and Equipment

Property, plant and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over estimated useful lives of

years for equipment and

years to

may

not

Our facility in Lampertheim, Germany serves as collateral for our borrowings from IKB. See Note

“Borrowing Arrangements” for more details.

Treasury Stock [Policy Text Block]

Treasury Stock

We account for treasury stock using the cost method. Costs include fees charged in connection with acquiring treasury stock.

Other Assets [Policy Text Block]

Other Assets

Other assets include marketable equity securities classified as available-for-sale

We have a

45%

equity interest in Powersem GmbH, or Powersem, a semiconductor manufacturer based in Germany, and an approximately

20%

equity interest in EB Tech Ltd., or EB Tech, a radiation services provider based in South Korea. In fiscal

2015,

we acquired approximately a

24%

equity interest in Automated Technology, Inc., or ATEC, an assembly and test services provider in the Philippines. These investments are accounted for using the equity method. In fiscal

2017,

we recognized income of

$809,000

on these investments. In fiscal

2016

and

2015,

we recognized losses of

$120,000

and

$7,000

on these investments, respectively.

Investments which do

not

have readily determinable fair values and are

not

required to be accounted for under the equity method are accounted for using the cost method. As of

March 31, 2017,

we have

$3.1

million of cost method investments. We did

not

hold any cost method investments as of

March 31, 2016.

Refer to Note

“Other Assets” and Note

13,

“Related Party Transactions” for further information regarding the investment balances and the related transactions of those long term investments.

Goodwill and Intangible Assets, Policy [Policy Text Block]

Goodwill and Intangible Assets

Goodwill and intangible assets with indefinite lives are reviewed at least annually for impairment charges during the quarter ending

March 31,

or more frequently if events and circumstances indicate that the asset might be impaired, in accordance with the authoritative guidance provided by FASB. We

first

assess qualitative factors to determine whether it is necessary to perform the

two

-step fair value-based impairment test described below. If we believe that, as a result of

the qualitative assessment, it is more likely than

not

that the fair value of a reporting unit is less than its carrying amount, the quantitative impairment test is required. Otherwise,

further testing is required.

Under the quantitative approach effective prior to

January 2017,

there were

two

steps in the determination of the impairment of goodwill. The

first

step compared the carrying amount of the net assets to the fair value of the reporting unit. The

second

January 2017,

FASB issued amended guidance which eliminated the

second

step in goodwill impairment testing. Under the new guidance, goodwill impairment is measured as the amount by which a reporting unit’s carrying value exceeds its fair value,

not

to exceed the carrying value of goodwill. The new guidance

March 31, 2017.

We operate our business as

one

reporting unit.

We assess the recoverability of the finite-lived intangible assets by examining the occurrences of certain events or changes of circumstances that indicate that the carrying amounts

may

not

be recoverable. After our initial assessment, if it is necessary, we perform the impairment test by determining whether

During the quarter ended

December 31, 2016,

based on our assessment, the intangible assets resulting from the RadioPulse acquisition were determined to be fully impaired and an impairment charge of

$1.4

million was recognized. See Note

“Goodwill and Intangible Assets” for further discussion of impairment analysis of goodwill and intangible assets and related charges recorded.

Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block]

Defined Benefit Plans

“Pension Plans” for further information.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments

valuations.

Advertising Costs, Policy [Policy Text Block]

Advertising Expense

We expense advertising as the costs are incurred. Advertising expense for the years ended

March 31, 2017,

2016

and

2015

was

$411,000,

$433,000

and

$437,000,

respectively. Advertising expense is included in “Selling, general and administrative expenses” on our consolidated statements of operations.

Research and Development Expense, Policy [Policy Text Block]

Research and Development Expense

Research and development costs are charged to operations as incurred.

Income Tax, Policy [Policy Text Block]

Income Taxes

not

that we will

not

realize all or a portion of our remaining deferred tax assets, we will increase our valuation allowance with a charge to income tax expense. Conversely, if we determine that it is more likely than

not

may

16,

“Income Taxes” for further discussion regarding income taxes.

Other Nonoperating Income Expense [Policy Text Block]

Other Income (Expense)

Guarantees, Indemnifications and Warranties Policies [Policy Text Block]

Indemnification

Product guarantees and warranties have

not

historically proved to be material. On occasion, we provide limited indemnification to customers against intellectual property infringement claims related to our products. To date, we have

not

liability for these indemnification agreements has been recorded as of

March 31, 2017

and

2016.

Legal Contingencies [Policy Text Block]

Legal Contingencies

Earnings Per Share, Policy [Policy Text Block]

Net Income (Loss) per Share

12,

“Computation of Earnings per Share.”

Accumulated Other Comprehensive Income [Policy Text Block]

Accumulated Other Comprehensive Income (Loss)

11,

“Accumulated Other Comprehensive Income (Loss).”

Concentration and Business Risk [Policy Text Block]

Concentration and Business Risks

Dependence on Third Parties for Wafer Fabrication and Assembly

Measured in dollars, in fiscal

2017

we manufactured approximately

52.6%

of our wafers, an integral component of our products, in our facilities in Germany, the UK, Massachusetts and California. We relied on

third

party suppliers to provide the remaining

47.4%.

There can be

assurance that material disruptions in supply will

not

occur in the future. In such event, we

may

have to identify and secure additional foundry capacity and

may

be unable to identify or secure sufficient foundry capacity to meet demand. Even if such capacity is available from another manufacturer, the qualification process could take

six

Dependence on Suppliers

We purchase silicon substrates from a limited number of vendors, most of whom we do

not

assurance that problems will

not

occur in the future with suppliers.

Employees Covered by Collective Bargaining Arrangements

Approximately

56.3%

and

94.9%

of our employees in the UK and Germany, respectively, are covered by collective bargaining arrangements.

Concentration of Credit Risk

We invest our excess cash primarily in foreign and domestic banks in short term time deposit and money market accounts. Maturities are generally

three

months or less. Our non-interest bearing domestic cash balances exceed federally insured limits. Additionally, we

may

invest in commercial paper with financial institutions that management believes to be creditworthy. These securities mature within

ninety

days or less and bear minimal credit risk. We have

not

experienced any losses on such investments.

We sell our products primarily to distributors and original equipment manufacturers. We perform ongoing credit evaluations of our customers and generally do

not

require collateral. An allowance for potential credit losses is maintained by us.

See Note

15,

“Segment and Geographic Information” for information related to customers that owe us more than

10%

of our total accounts receivable.

We continually monitor the credit risk in our portfolio and mitigate our credit risk exposures in accordance with the policies approved by our Board of Directors.

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Stock-Based Compensation Plans

We have employee equity incentive plans and an employee stock purchase plan, which are described more fully in Note

10,

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Pronouncements and Accounting Changes

May 2014,

five

December 15, 2017,

including interim periods during the annual period. Early adoption is permitted for annual periods commencing after

December 15, 2016.

Two different transition methods are available: full retrospective method and a modified retrospective approach.

We do

not

have a material impact on our financial position and results of operations, as our revenue is primarily generated from the sale of finished products to customers.

Sales predominantly contain a single delivery element and revenue is recognized at a single point in time when ownership, risks, and rewards transfer. We do

not

expect to change the manner or timing of recognizing revenue on a majority of our revenue transactions.

July 2015,

FASB issued an amendment to modify the inventory measurement guidance in Topic

330,

Inventory

, for inventory that is measured using the methods other than last-in,

first

330

December 15, 2016,

not

expect this change to have a significant impact on our consolidated financial statements.

January 2016,

not

result in consolidation and are

not

have a readily determinable fair value and do

not

qualify for the practical expedient to estimate fair value under Accounting Standards Codification,

Fair Value Measurements

, or ASC

820,

and as such these investments

may

be measured at cost. This guidance is effective for financial statements issued for fiscal years beginning after

December 15, 2017,

and interim periods within those fiscal years. We are currently evaluating the impact of this standard on our consolidated financial statements.

February 2016,

FASB issued amended guidance for lease arrangements, which requires lessees to recognize the following for all leases with terms longer than

December 15, 2018,

and interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the impact of this amended guidance on our consolidated financial statements.

March 2016,

December 15, 2016,

and interim periods within those fiscal years. Early adoption is permitted in any interim or annual period for which financial statements have

not

yet been issued or have

not

been made available for issuance. We are currently evaluating the impact of this amended guidance on our consolidated financial statements.

August 2016,

FASB issued amended guidance that provides clarification on cash flow classification related to

eight

December 15, 2017,

not

expect this change to have a significant impact on our consolidated financial statements.

October 2016,

third

party or otherwise recovered through use. The guidance will be effective for fiscal years beginning after

December 15, 2017,

including interim reporting periods within those annual reporting periods. Early adoption is permitted in the

first

November 2016,

December 15, 2017,

and interim periods within those fiscal years, and is to be applied on a retrospective basis. Early adoption is permitted. We have adopted the guidance on a retrospective basis from the quarter ended

December 31, 2016.

Based on the guidance, the beginning and ending balance of cash and cash equivalents for the respective periods in our audited condensed consolidated statements of cash flow included restricted cash.

January 2017,

December 15, 2017,

January 2017,

FASB issued amended guidance which eliminates the

second

step in goodwill impairment testing in which

not

to exceed the carrying value of goodwill. The guidance is effective on a prospective basis for fiscal years beginning after

December 15, 2019,

and interim periods within those fiscal years.

Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after

January

2017.

We have adopted the guidance on a prospective basis commencing with the quarter ended

March 31, 2017.

The adoption did

not

have any impact on our consolidated financial statements for the quarter ended

March 31, 2017.

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Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Allowance for Accounts Receivable Ship and Debit [Table Text Block]

Balance March 31, 2014	$	1,071
Additions		5,765
Deductions		(5,777	)
Balance March 31, 2015		1,059
Additions		4,479
Deductions		(4,672	)
Balance March 31, 2016		866
Additions		7,363
Deductions		(6,680	)
Balance March 31, 2017	$	1,549

Schedule of Excess Inventory Reserve [Table Text Block]

Balance at March 31, 2014	$	24,304
Utilization or sale		(1,637	)
Scrap		(2,901	)
Additional provision		4,487
Foreign currency translation adjustments		(1,500	)
Balance at March 31, 2015		22,753
Utilization or sale		(2,455	)
Scrap		(3,217	)
Additional provision		4,125
Foreign currency translation adjustments		174
Balance at March 31, 2016		21,380
Utilization or sale		(3,813	)
Scrap		(3,682	)
Additional provision		5,838
Foreign currency translation adjustments		(425	)
Balance at March 31, 2017	$	19,298

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Note 3 - Business Combinations (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

	Purchase Consideration Allocation
Cash and cash equivalents and restricted cash	$	196
Accounts receivable		1,497
Inventories		534
Property, plant and equipment		24
Prepaid expenses and other current assets		547
Identifiable intangible assets		2,867
Short-term borrowings		(2,354	)
Accounts payable		(614	)
Accruals and other liabilities		(1,926	)
Total identifiable net liabilities		771
Goodwill		14,887
Total purchase consideration	$	15,658

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

			Amortization	Estimated
	Fair Value		Method	Useful Life
	(In thousands)			(In months)
Developed intellectual property	$	1,005	Accelerated		60
In-process research and development expenses (1)		1,188	Straight-line		60
Customer relationships		500	Accelerated		36
Contract backlog		174	Straight-line		6
Total	$	2,867

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Note 4 - Fair Value (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	March 31, 2017 (1)						March 31, 2016 (1)
			Fair Value Measured at						Fair Value Measured at
			Reporting Date Using						Reporting Date Using
Description	Total		Level 1		Level 2		Total		Level 1		Level 2
Money market funds (2)	$	90,752	$	90,752	$	-	$	115,974	$	115,974	$	-
Marketable equity securities (3)		1,771		1,771		-		1,749		1,749		-
Auction rate preferred securities (3)		350		-		350		350		-		350
Total assets measured at fair value	$	92,873	$	92,523	$	350	$	118,073	$	117,723	$	350

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Note 5 - Other Assets (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Other Assets, Noncurrent [Table Text Block]

	March 31,
	2017		2016
Marketable equity securities	$	1,771	$	1,749
Auction rate preferred securities		350		350
Long-term equity method investments		11,589		10,977
Other items, including cost method investments		4,265		686
Total	$	17,975	$	13,762

Available-for-sale Securities [Table Text Block]

	Fiscal Year 2017									Fiscal Year 2016
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value		Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value

Marketable equity securities	$	2,116	$	254	$	(599	)	$	1,771	$	1,875	$	46	$	(172	)	$	1,749
Auction rate preferred securities	$	350	$	-	$	-		$	350	$	350	$	-	$	-		$	350

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than 12 Months				12 Months or Greater				Total
Period	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
March 31, 2017	$	552	$	469	$	47	$	263	$	599	$	732
March 31, 2016	$	29	$	581	$	143	$	932	$	172	$	1,513

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

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Note 6 - Balance Sheet Details (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	March 31,
	2017			2016
Accounts receivable, gross	$	45,856		$	41,219
Allowances		(4,689	)		(2,779	)
Accounts receivable, net	$	41,167		$	38,440

Schedule of Allowance Movement [Table Text Block]

	Balance at Beginning of Year		Additions		Utilization			Translation Adjustments			Balance at End of Year
Allowances for accounts receivable and for doubtful accounts:
Year ended March 31, 2017	$	2,779	$	10,608	$	(8,657	)	$	(41	)	$	4,689
Year ended March 31, 2016	$	2,768	$	6,795	$	(6,799	)	$	15		$	2,779
Year ended March 31, 2015	$	3,013	$	8,935	$	(9,004	)	$	(176	)	$	2,768

Schedule of Inventory, Current [Table Text Block]

	March 31,
	2017		2016
Raw materials	$	17,920	$	18,269
Work in process		45,634		41,549
Finished goods		25,882		29,786
Total	$	89,436	$	89,604

Property, Plant and Equipment [Table Text Block]

	March 31,
	2017			2016
Property and plant (useful life of 24 years to 50 years)	$	38,195		$	35,290
Equipment owned (useful life of 2 to 8 years)		137,105			139,318
Leasehold improvements (useful life of up to 40 years)		1,064			1,304
Property, plant and equipment, gross		176,364			175,912
Accumulated depreciation		(134,124	)		(133,289	)
Property, plant and equipment, net	$	42,240		$	42,623

Schedule of Accrued Liabilities [Table Text Block]

	March 31,
	2017		2016

Uninvoiced goods and services	$	12,703	$	8,824
Compensation and benefits		6,707		7,540
Income taxes		3,521		2,066
Commissions, royalties and other		2,416		2,860
Total	$	25,347	$	21,290

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Note 7 - Goodwill and Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Goodwill [Table Text Block]

	March 31,
	2017			2016
Goodwill	$	56,024		$	41,137
Accumulated impairment losses		(13,192	)		(13,192	)
Accumulated currency translation adjustment		(477	)		(570	)
Net goodwill at beginning of year		42,355			27,375
Goodwill acquired in acquisition		-			14,887
Currency translation adjustment		(128	)		93
Net goodwill at end of year	$	42,227		$	42,355

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	Gross Intangible Assets		Accumulated Impairment		Accumulated Amortization		Net Intangible Assets
Developed intellectual property	$	17,309	$	265	$	14,168	$	2,876
Customer relationships		13,520		123		13,397		-
In-process intellectual property		1,188		1,003		185		-
Contract backlog		7,329		-		7,329		-
Other intangible assets		1,591		-		1,483		108
Total identifiable intangible assets	$	40,937	$	1,391	$	36,562	$	2,984

	Gross Intangible Assets		Accumulated Impairment		Accumulated Amortization		Net Intangible Assets
Developed intellectual property	$	17,309	$	-	$	11,639	$	5,670
Customer relationships		13,520		-		12,961		559
In-process intellectual property		1,188		-		-		1,188
Contract backlog		7,329		-		7,329		-
Other intangible assets		1,599		-		1,409		190
Total identifiable intangible assets	$	40,945	$	-	$	33,338	$	7,607

Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]

			Amortization	Estimated
	Fair Value		Method	Useful Life
	(In thousands)			(In months)

RadioPulse:
Developed intellectual property	$	1,005	Accelerated		60
Customer relationships		500	Accelerated		36
In-process research and development expense		1,188	Straight-line		60
Contract backlog		174	Straight-line		6
Total for RadioPulse	$	2,867

Acquired MCU Business:
Developed intellectual property	$	11,504	Straight-line		60
Customer relationships		6,920	Accelerated		36
Contract backlog		5,155	Straight-line		9
Trade name		421	Straight-line		60
Total for Acquired MCU Business	$	24,000

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Note 8 - Borrowing Arrangements (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Long-term Debt Instruments [Table Text Block]

Fiscal Year Payable	Amount
2018	$	1,058
2019		1,047
2020		73,648
2021		1,048
2022		1,048
Thereafter		-
Total		77,849
Less: current portion		1,058
Long-term portion (1)	$	76,791

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

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Note 9 - Pension Plans (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Net Benefit Costs [Table Text Block]

	Year Ended March 31,
	2017			2016			2015
Service cost	$	109		$	101		$	104
Interest cost on projected benefit obligation		1,313			1,450			1,803
Expected return on plan assets		(1,183	)		(1,721	)		(1,910	)
Recognized actuarial loss		387			438			179
Net periodic pension expense	$	626		$	268		$	176

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	Year Ended March 31,
	2017			2016
Change in projected benefit obligation:
Projected benefit obligation at the beginning of the year	$	45,021		$	47,346
Service cost		109			101
Interest cost		1,313			1,450
Actuarial (gain) loss		3,356			(1,549	)
Benefits paid		(1,543	)		(1,830	)
Foreign currency adjustment		(5,073	)		(497	)
Projected benefit obligation at year end	$	43,183		$	45,021

Change in plan assets:
Fair value of plan assets at the beginning of the year	$	28,714		$	30,114
Actual return (loss) on plan assets		3,526			(156	)
Employer contribution		993			1,009
Benefits paid from assets		(1,083	)		(1,388	)
Foreign currency adjustment		(3,868	)		(865	)
Plan assets at fair value at year end	$	28,282		$	28,714
Unfunded status of the plan at year end	$	14,901		$	16,307

Pension liability recognized on the balance sheet due after one year	$	14,901		$	16,307

Plans with projected benefit obligation and accumulated benefit obligation in excess of plan assets:
Projected benefit obligation at year end	$	43,183		$	45,021
Accumulated benefit obligation at year end	$	42,652		$	44,509
Plan assets at fair value at year end	$	28,282		$	28,714

Amounts recognized in accumulated other comprehensive income (loss):
Unrecognized actuarial loss, before tax	$	(11,457	)	$	(12,140	)
Amount recognized as component of stockholders’ equity – pretax	$	(11,457	)	$	(12,140	)
Accumulated benefit obligation at year end	$	42,652		$	44,509

Schedule of Assumptions Used [Table Text Block]

	Year End March 31,
	2017				2016
Discount rate		1.9	-	5.2%		1.9	-	4.6%
Expected long term rate of return on assets		3.8	-	6.0%		4.4	-	7.0%
Salary scale			5.0%				5.0%

Defined Benefit Plan Plan Assets Fair Value [Table Text Block]

	March 31, 2017						March 31, 2016
Description	Level 1		Level 2		Total		Level 1		Level 2		Total
Cash and cash funds	$	136	$	-	$	136	$	121	$	-	$	121
Equity		314		-		314		351		-		351
Fixed interest		1,203		58		1,261		1,225		96		1,321
Mutual funds		13,181		13,390		26,571		13,527		13,394		26,921
Total	$	14,834	$	13,448	$	28,282	$	15,224	$	13,490	$	28,714

Schedule of Expected Benefit Payments [Table Text Block]

Fiscal Year Ended:	Benefit Payment
March 31, 2018	$	1,525
March 31, 2019		1,561
March 31, 2020		1,632
March 31, 2021		1,660
March 31, 2022		1,611
Five fiscal years ended March 31, 2027		9,449
Total benefit payments for the ten fiscal years ended March 31, 2027	$	17,438

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Note 10 - Employee Equity Incentive Plans (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Year Ended March 31,
Statement of Operations Classifications	2017		2016		2015

Cost of goods sold	$	362	$	488	$	433
Research, development and engineering (1)		1,144		1,272		814
Selling, general and administrative		1,932		1,832		1,620
Stock-based compensation effect in income before income tax provision		3,438		3,592		2,867
Provision for income tax		694		660		1,009
Net stock-based compensation effects on net income	$	2,744	$	2,932	$	1,858

Schedule of Employee Service Share Based Compensation Fair Value Assumptions and Methodology [Table Text Block]

	Stock Options									Purchase Plan
	Year Ended March 31,									Year Ended March 31,
	2017			2016			2015			2017			2016			2015
Weighted average estimated fair value of grant per share	$	4.48		$	4.83		$	5.54		$	3.28		$	3.33		$	2.90
Risk-free interest rate		1.6	%		1.8	%		1.8	%		0.4	%		0.1	%		0.1	%
Expected term in years		6.41			6.45			6.25			0.75			0.50			0.50
Volatility		40.6	%		44.9	%		52.2	%		37.5	%		39.8	%		36.9	%
Dividend yield		0.4	%		1.2	%		1.0	%		0.7	%		1.1	%		1.1	%

Share-based Compensation, Stock Options, Activity [Table Text Block]

Stock compensation activities under our equity incentive plans for fiscal 2017, 2016 and 2015 were as follows:

				Options Outstanding
	Shares Available for Grant			Number of Shares (1)			Intrinsic Value (2)		Weighted Average Exercise Price per Share
								(000)

Balances, March 31, 2014		1,930,250			5,201,635		$	8,658	$	10.22
Options granted		(249,000	)		249,000				$	11.83
Options exercised		-			(339,374	)	$	1,310	$	8.62
Options cancelled		39,750			(94,250	)			$	11.46
Options expired		26,000			(74,500	)			$	11.17
Balances, March 31, 2015		1,747,000			4,942,511		$	10,831	$	10.37
Options granted		(1,124,000	)		1,124,000				$	11.72
Options exercised		-			(382,826	)	$	1,551	$	9.02
Options cancelled		14,500			(14,500	)			$	11.31
Options expired		-			(434,788	)			$	14.68
Balances, March 31, 2016		637,500			5,234,397		$	6,456	$	10.40
New shares authorized (3)		2,000,000
Options granted		(746,000	)		746,000				$	11.06
Options exercised		-			(859,852	)	$	3,112	$	9.10
Options cancelled		7,500			(7,500	)			$	13.37
Options expired		22,500			(27,500	)			$	11.81
Balances, March 31, 2017		1,921,500			5,085,545		$	19,570	$	10.70

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Options Outstanding										Options Exercisable
Exercise Price per Share				Number of Shares Outstanding		Weighted Average Contractual Life		Weighted Average Exercise Price per Share		Number of Shares Exercisable		Weighted Average Exercise Price per Share
$	5.01	-	7.75		576,500		1.6	$	6.66		576,500	$	6.66
$	7.76	-	10.00		843,295		4.7	$	9.30		783,545	$	9.30
$	10.01	-	12.50		2,890,750		6.9	$	11.31		1,417,000	$	11.51
$	12.51	-	14.50		775,000		5.4	$	12.95		523,250	$	12.78
$	5.01	-	14.50		5,085,545		5.7	$	10.70		3,300,295	$	10.34

Options Outstanding										Options Exercisable
Exercise Price per Share				Number of Shares Outstanding		Weighted Average Contractual Life		Weighted Average Exercise Price per Share		Number of Shares Exercisable		Weighted Average Exercise Price per Share
$	5.01	-	7.75		819,897		2.6	$	6.63		819,897	$	6.63
$	7.76	-	10.00		1,223,500		4.8	$	9.33		1,017,750	$	9.29
$	10.01	-	12.50		2,448,000		6.6	$	11.42		1,331,916	$	11.52
$	12.51	-	13.37		743,000		6.1	$	12.96		450,000	$	12.69
$	5.01	-	13.37		5,234,397		5.5	$	10.40		3,619,563	$	9.93

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Note 11 - Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Foreign Currency			Unrealized Gains (Losses) on Securities			Defined Benefit Pension Plans			Accumulated Other Comprehensive (Loss)
Balance as of March 31, 2014	$	10,535		$	325		$	(5,831	)	$	5,029
Other comprehensive income (loss) before reclassifications		(24,112	)		(1,536	)		(3,830	)		(29,478	)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)		-			1,218			143			1,361
Net current period other comprehensive income (loss)		(24,112	)		(318	)		(3,687	)		(28,117	)
Balance as of March 31, 2015		(13,577	)		7			(9,518	)		(23,088	)
Other comprehensive income (loss) before reclassifications		2,938			(362	)		(71	)		2,505
Net gain (loss) reclassified from accumulated other comprehensive income (loss)		-			273			44			317
Net current period other comprehensive income (loss)		2,938			(89	)		(27	)		2,822
Balance as of March 31, 2016		(10,639	)		(82	)		(9,545	)		(20,266	)
Other comprehensive income (loss) before reclassifications		(8,594	)		(106	)		196			(8,504	)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)		-			(31	)		256			225
Net current period other comprehensive income (loss)		(8,594	)		(137	)		452			(8,279	)
Balance as of March 31, 2017	$	(19,233	)	$	(219	)	$	(9,093	)	$	(28,545	)

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

Accumulated Other Comprehensive Income (Loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)									Impacted Line Item on Consolidated Statements of Operations
	Year Ended March 31,
	2017			2016			2015

Net gain (loss) on investments	$	201		$	(1	)	$	30		Other income (expense), net
Impairment of marketable securities		(151	)		(454	)		(1,903	)	Other income (expense), net
Recognized actuarial loss		(387	)		(437	)		(179	)	Cost of goods sold
Subtotal		(337	)		(892	)		(2,052	)	Income before income tax provision
Tax impact		112			575			691		Provision for income tax
Total reclassifications for the year	$	(225	)	$	(317	)	$	(1,361	)	Net income

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Note 12 - Computation of Earnings Per Share (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended March 31,
	2017		2016		2015
Net income	$	21,348	$	14,741	$	23,740
Weighted average shares - basic		31,544		31,579		31,531
Weighted average shares - diluted		32,248		32,381		32,239
Net income per share - basic	$	0.68	$	0.47	$	0.75
Net income per share - diluted	$	0.66	$	0.46	$	0.74

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Note 15 - Segment and Geographic Information (Tables)

12 Months Ended

Mar. 31, 2017

Revenue from External Customers by Geographic Areas [Table Text Block]

	Year Ended March 31,
	2017		2016		2015
United States	$	81,499	$	75,994	$	85,314
Europe and the Middle East:
Austria		2,313		1,836		2,290
Finland		2,178		1,899		1,669
France		9,553		9,076		7,917
Germany		37,919		33,215		32,866
Hungary		1,942		2,082		2,571
Italy		4,091		4,328		4,645
Netherlands		4,488		3,608		2,315
Russia		1,263		4,773		5,051
Sweden		1,694		2,155		4,460
Switzerland		2,311		2,789		2,569
Turkey		1,929		2,376		2,658
United Kingdom		14,042		13,502		19,832
Other		10,097		10,700		11,259
Asia Pacific:
China		84,447		79,575		83,597
Indonesia		2,160		2,128		3,224
Japan		6,995		9,271		8,469
Malaysia		4,692		4,662		5,580
Singapore		13,509		12,353		11,694
South Korea		19,282		23,215		22,371
Taiwan		2,051		3,151		2,688
Thailand		3,547		3,904		4,300
Other		1,557		1,929		1,148
Rest of the World:
India		4,315		4,293		5,163
Other		4,249		4,395		5,117
Total	$	322,123	$	317,209	$	338,767

Revenue from External Customers by Products and Services [Table Text Block]

	Year Ended March 31,
	2017		2016		2015
Power semiconductors	$	221,312	$	213,347	$	219,445
Integrated circuits		82,067		84,078		95,547
Systems and RF power semiconductors		18,744		19,784		23,775
Total	$	322,123	$	317,209	$	338,767

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Year Ended March 31,
	2017			2016			2015
Revenues:
Distributor A		12.3	%		12.2	%		10.2	%
Distributor B		10.8	%		less than 10	%		10.5	%

	March 31,
	2017			2016
Accounts Receivable:
Distributor A		15.2	%		18.2	%
Distributor C		10.5	%		less than 10	%

Summary of Net Revenues, Net Income of Domestic and Foreign Operations [Table Text Block]

	Year Ended March 31,
	2017		2016		2015
Net revenues:
Foreign	$	148,159	$	159,984	$	188,964
Domestic		173,964		157,225		149,803
Total	$	322,123	$	317,209	$	338,767

Net income:
Foreign	$	17,172	$	11,039	$	21,379
Domestic		4,176		3,702		2,361
Total	$	21,348	$	14,741	$	23,740

Long-lived Assets by Geographic Areas [Table Text Block]

	March 31,
	2017		2016		2015
Property, plant and equipment, net:
United States	$	25,284	$	26,792	$	27,740
Germany		15,594		14,506		13,228
Other countries		1,362		1,325		1,577
Total property, plant and equipment, net	$	42,240	$	42,623	$	42,545

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Note 16 - Income Taxes (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	Year Ended March 31,
	2017		2016		2015
Domestic	$	7,997	$	9,030	$	3,390
International		20,903		14,459		27,040
Total	$	28,900	$	23,489	$	30,430

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended March 31,
	2017			2016		2015
Current:
Federal	$	406		$	1,418	$	201
State		(560	)		126		83
Foreign		4,532			3,436		5,066
Total current		4,378			4,980		5,350

Deferred:
Federal		1,867			3,554		945
State		1,256			189		20
Foreign		51			25		375
Total deferred		3,174			3,768		1,340
Total provision for income tax	$	7,552		$	8,748	$	6,690

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended March 31,
	2017			2016			2015
	(%)			(%)			(%)
Statutory federal income tax rate		35			35			35
State taxes, net of federal tax benefit		1			1			1
Expense (benefit) of lower-tax foreign jurisdictions		(17	)		(10	)		(15	)
Tax credits		(2	)		(3	)		(1	)
Valuation allowances		4			3			-
Permanent items		-			(5	)		-
Tax reserves		1			-			-
Tax asset write-off		2			10			-
Foreign income		2			6			2
Effective tax provision rate		26			37			22

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	March 31,
	2017			2016
Deferred tax assets:
Reserves and allowances	$	5,504		$	6,018
Other liabilities and accruals		6,297			6,176
Depreciable assets		404			83
Net operating loss carryforwards		10,236			11,675
Share-based compensation		4,721			5,098
Credits carryforward		2,188			2,440
Total deferred tax assets		29,350			31,490
Less: Valuation allowances and other reserves		(4,611	)		(3,466	)
Net deferred tax assets	$	24,739		$	28,024

Summary of Income Tax Contingencies [Table Text Block]

Balance as of March 31, 2014	$	6,978
Lapse of statute of limitations		(3,070	)
Increases in balances related to tax positions taken during prior periods		213
Increases in balances related to tax positions taken during the current period		2,831
Balance as of March 31, 2015		6,952
Lapse of statute of limitations		(772	)
Increases in balances related to tax positions taken during prior periods		129
Increases in balances related to tax positions taken during the current period		637
Balance as of March 31, 2016		6,946
Lapse of statute of limitations		(1,461	)
Decreases in balances related to tax positions taken during prior periods		(63	)
Increases in balances related to tax positions taken during the current period		1,021
Balance as of March 31, 2017	$	6,443

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Note 17 - Commitments and Contingencies (Tables)

12 Months Ended

Mar. 31, 2017

Schedule of Capital Leases Operating Leases and Purchase Obligations [Table Text Block]

Fiscal Year Ended March 31,	Operating Leases		Other Purchase Obligations
2018	$	1,350	$	23,700
2019		1,209		2,776
2020		1,087		-
2021		667		-
2022		473		-
Total minimum payments	$	4,786	$	26,476

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Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Mar. 31, 2017

Quarterly Financial Information [Table Text Block]

	Three Months Ended
	March 31, 2017		December 31, 2016		September 30, 2016		June 30, 2016
Net revenues	$	83,372	$	79,484	$	78,629	$	80,638
Gross profit		29,194		26,939		25,455		23,994
Operating income		9,233		7,819		6,771		5,029
Net income	$	9,294	$	5,100	$	3,935	$	3,019

Net income per share:
Basic (1)	$	0.29	$	0.16	$	0.12	$	0.10
Diluted (1)	$	0.28	$	0.16	$	0.12	$	0.09
Weighted average shares used in per share calculation:
Basic		31,724		31,558		31,490		31,401
Diluted		32,635		32,209		32,145		32,001

	Three Months Ended
	March 31, 2016		December 31, 2015		September 30, 2015		June 30, 2015
Net revenues	$	79,772	$	75,133	$	80,257	$	82,047
Gross profit		24,115		24,029		26,012		25,602
Operating income		6,834		6,262		7,033		5,704
Net income (2)	$	6,197	$	2,286	$	3,273	$	2,985

Net income per share:
Basic (1)	$	0.20	$	0.07	$	0.10	$	0.09
Diluted (1)	$	0.19	$	0.07	$	0.10	$	0.09
Weighted average shares used in per share calculation:
Basic		31,441		31,487		31,651		31,746
Diluted		32,076		32,343		32,380		32,733

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Note 2 - Summary of Significant Accounting Policies (Details Textual) € in Thousands, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2015	Dec. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2017 EUR (€)	Dec. 12, 2014
Revenue from Distributors			58.70%	56.70%	55.60%
Allowances for Stock Rotation			$ 1,459	$ 1,494	$ 1,741
Restricted Cash and Cash Equivalents, Current			$ 1,330	277
Gross Profit Margin from Sales of Excess Inventory			100.00%
Product Part Numbers			10,000			10,000
Inventory Valuation Reserves, Lower of Cost or Market, Value			$ 384	409
Income (Loss) from Equity Method Investments			809	(120)	(7)
Cost Method Investments			$ 3,100	0
Number of Reporting Units			1
Impairment of Intangible Assets, Finite-lived		$ 1,400	$ 1,391
Advertising Expense			$ 411	433	437
Percentage of Wafers Manufactured Internally			52.60%			52.60%
Percentage of Wafers Manufactured Externally			47.40%			47.40%
Workforce Subject to Collective Bargaining Arrangements [Member] \| Labor Force Concentration Risk [Member] \| UNITED KINGDOM
Concentration Risk, Percentage			56.30%
Workforce Subject to Collective Bargaining Arrangements [Member] \| Labor Force Concentration Risk [Member] \| GERMANY
Concentration Risk, Percentage			94.90%
Powersem GmbH [Member]
Equity Method Investment, Ownership Percentage			45.00%			45.00%
EB Tech Ltd [Member]
Equity Method Investment, Ownership Percentage			20.00%			20.00%
ATEC [Member]
Equity Method Investment, Ownership Percentage			24.00%			24.00%	24.00%
Income (Loss) from Equity Method Investments			$ 765	$ (9)	$ (140)
Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life			2 years
Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life			8 years
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life			24 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life			50 years
April 2015 IKB Deutsche Industriebank Loan Payable [Member]
Security Deposit			$ 1,100			€ 1,000
Security Deposit, Maturity Date	Dec. 29, 2017

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Note 2 - Summary of Significant Accounting Policies - Allowance for Ship and Debit (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Beginning Balance	$ 866	$ 1,059	$ 1,071
Additions	7,363	4,479	5,765
Deductions	(6,680)	(4,672)	(5,777)
Ending Balance	$ 1,549	$ 866	$ 1,059

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Note 2 - Summary of Significant Accounting Policies - Excess and Obsolete Inventory Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Beginning Balance	$ 21,380	$ 22,753	$ 24,304
Utilization or sale	(3,813)	(2,455)	(1,637)
Scrap	(3,682)	(3,217)	(2,901)
Additional provision	5,838	4,125	4,487
Foreign currency translation adjustments	(425)	174	(1,500)
Ending Balance	$ 19,298	$ 21,380	$ 22,753

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Note 3 - Business Combinations (Details Textual) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		11 Months Ended	12 Months Ended
	May 01, 2015	May 31, 2015	Dec. 31, 2016	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Impairment of Intangible Assets, Finite-lived			$ 1,400			$ 1,391
Payments to Acquire Businesses, Net of Cash Acquired							14,472	$ 2,297
Goodwill, Acquired During Period		$ 14,900					14,887
Goodwill, Foreign Currency Translation Gain (Loss)						(128)	93
RadioPulse [Member]
Business Combination, Consideration Transferred	$ 15,700
Payments to Acquire Businesses, Gross	14,700
Business Combination, Consideration Transferred, Other	1,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	6,000
Business Acquisition, Transaction Costs	248
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards	249						$ 249
Business Combination, Contingent Consideration, Liability	$ 0					0
Impairment of Intangible Assets, Finite-lived			$ 1,400
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					$ 4,100
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					$ (3,600)
Other Acquisition [Member]
Payments to Acquire Businesses, Net of Cash Acquired				$ 2,300
Cash Acquired from Acquisition				204
Goodwill, Acquired During Period				2,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt				$ 723
Goodwill, Foreign Currency Translation Gain (Loss)						$ (605)

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Note 3 - Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	May 01, 2015	Mar. 31, 2015
Goodwill	$ 42,227	$ 42,355		$ 27,375
RadioPulse [Member]
Cash and cash equivalents and restricted cash			$ 196
Accounts receivable			1,497
Inventories			534
Property, plant and equipment			24
Prepaid expenses and other current assets			547
Identifiable intangible assets			2,867
Short-term borrowings			(2,354)
Accounts payable			(614)
Accruals and other liabilities			(1,926)
Total identifiable net liabilities			771
Goodwill			14,887
Total purchase consideration			$ 15,658

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Note 3 - Business Combinations - Acquired Finite-lived Intangible Assets (Details)
$ in Thousands

May 01, 2015

USD ($)

Developed Technology Rights [Member]

$ 2,867

Finite-Lived Intangible Assets, Amortization Method

$ 1,005

Accelerated

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

5 years

In Process Research and Development [Member]

Finite-Lived Intangible Assets, Amortization Method

$ 1,188

^[1]

Straight-line

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

5 years

^[1]

Customer Relationships [Member]

Finite-Lived Intangible Assets, Amortization Method

$ 500

Accelerated

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

3 years

Order or Production Backlog [Member]

Finite-Lived Intangible Assets, Amortization Method

$ 174

Straight-line

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

180 days

[1]	Amortization started in the quarter ended December 31, 2016 upon the completion of the research and development activities of the corresponding projects.

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Note 4 - Fair Value (Details Textual) xbrli-pure in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Debt, Long-term and Short-term, Combined Amount	$ 77,800	$ 87,100
Other than Temporary Impairment Losses, Investments	$ 151	$ 454	$ 1,900
Derivative, Number of Instruments Held	0	0
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure, Recurring	$ 0	$ 0
Liabilities, Fair Value Disclosure, Recurring	$ 0	$ 0

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Note 4 - Fair Value - Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands

Mar. 31, 2017

Mar. 31, 2016

$ 1,771

$ 1,749

Fair Value, Measurements, Recurring [Member]

350

Money market funds

^[1],[2]

90,752

115,974

^[2],[3]

1,771

1,749

Total assets measured at fair value

^[2],[3]

350

^[2]

92,873

118,073

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Money market funds

^[1],[2]

90,752

115,974

^[2],[3]

1,771

1,749

Total assets measured at fair value

^[2],[3]

^[2]

92,523

117,723

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Money market funds

^[1],[2]

^[2],[3]

Total assets measured at fair value

^[2],[3]

350

^[2]

$ 350

[1]	Included in "Cash and cash equivalents" on our audited consolidated balance sheets.
[2]	We did not have any recurring fair value measurements of assets or liabilities whose fair value was measured using significant unobservable inputs.
[3]	Included in "Other assets" on our audited consolidated balance sheets.

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Note 5 - Other Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Dec. 12, 2014
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	$ (219)	$ (82)
Available-for-sale Securities, Gross Realized Gain (Loss)	201
Equity Method Investments	11,589	10,977
Income (Loss) from Equity Method Investments	809	(120)	$ (7)
Cost Method Investments	$ 3,100	0
Powersem GmbH [Member]
Equity Method Investment, Ownership Percentage	45.00%
Equity Method Investments	$ 2,500	2,500
EB Tech Ltd [Member]
Equity Method Investment, Ownership Percentage	20.00%
Equity Method Investments	$ 2,600	2,700
ATEC [Member]
Equity Method Investment, Ownership Percentage	24.00%			24.00%
Equity Method Investments	$ 6,500	5,700		$ 5,900
Income (Loss) from Equity Method Investments	$ 765	(9)	$ (140)
Sold Securities [Member]
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax		$ (28)

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Note 5 - Other Assets - Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Marketable equity securities	$ 1,771	$ 1,749
Auction rate preferred securities	350	350
Long-term equity method investments	11,589	10,977
Other items, including cost method investments	4,265	686
Total	$ 17,975	$ 13,762

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Note 5 - Other Assets - Available-for-sale Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Equity Securities [Member]
Gross unrealized (losses)	$ (599)	$ (172)
Fair value	1,771	1,749
Cost	2,116	1,875
Gross unrealized gains	254	46
Auction Rate Securities [Member]
Gross unrealized (losses)
Fair value	350	350
Cost	350	350
Gross unrealized gains

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Note 5 - Other Assets - Unrealized Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Total gross unrealized losses	$ 599	$ 172
Total fair value	732	1,513
Less than 12 months gross unrealized losses	552	29
Less than 12 months fair value	469	581
12 months or greater gross unrealized losses	47	143
12 months or greater fair value	$ 263	$ 932

XML 69 R56.htm IDEA: XBRL DOCUMENT

Note 6 - Balance Sheet Details (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Depreciation	$ 7.5	$ 8.4	$ 11.3

XML 70 R57.htm IDEA: XBRL DOCUMENT

Note 6 - Balance Sheet Details - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Accounts receivable, gross	$ 45,856	$ 41,219
Allowances	(4,689)	(2,779)	$ (2,768)	$ (3,013)
Accounts receivable, net	$ 41,167	$ 38,440

XML 71 R58.htm IDEA: XBRL DOCUMENT

Note 6 - Balance Sheet Details - Allowances Movement (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Allowances for accounts receivable and for doubtful accounts:
Translation adjustments	$ (41)	$ 15	$ (176)
Balance at end of year	4,689	2,779	2,768
Balance at beginning of year	2,779	2,768	3,013
Additions	10,608	6,795	8,935
Utilization	$ (8,657)	$ (6,799)	$ (9,004)

XML 72 R59.htm IDEA: XBRL DOCUMENT

Note 6 - Balance Sheet Details - Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Raw materials	$ 17,920	$ 18,269
Work in process	45,634	41,549
Finished goods	25,882	29,786
Total	$ 89,436	$ 89,604

XML 73 R60.htm IDEA: XBRL DOCUMENT

Note 6 - Balance Sheet Details - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Property, plant and equipment, gross	$ 176,364	$ 175,912
Accumulated depreciation	(134,124)	(133,289)
Property, plant and equipment, net	42,240	42,623	$ 42,545
Building and Building Improvements [Member]
Property, plant and equipment, gross	38,195	35,290
Equipment [Member]
Property, plant and equipment, gross	137,105	139,318
Leasehold Improvements [Member]
Property, plant and equipment, gross	$ 1,064	$ 1,304

XML 74 R61.htm IDEA: XBRL DOCUMENT

Note 6 - Balance Sheet Details - Property, Plant and Equipment (Details) (Parentheticals)	12 Months Ended
	Mar. 31, 2017
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	24 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	50 years
Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	8 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	40 years

XML 75 R62.htm IDEA: XBRL DOCUMENT

Note 6 - Balance Sheet Details - Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Uninvoiced goods and services	$ 12,703	$ 8,824
Compensation and benefits	6,707	7,540
Income taxes	3,521	2,066
Commissions, royalties and other	2,416	2,860
Total	$ 25,347	$ 21,290

XML 76 R63.htm IDEA: XBRL DOCUMENT

Note 7 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2015	Dec. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Goodwill, Acquired During Period	$ 14,900			$ 14,887
Amortization of Intangible Assets			3,068	5,555	$ 5,978
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months			2,400
Finite-Lived Intangible Assets, Amortization Expense, Year Two			596
Goodwill, Impaired, Accumulated Impairment Loss			13,192	13,192
Impairment of Intangible Assets, Finite-lived		$ 1,400	$ 1,391

XML 77 R64.htm IDEA: XBRL DOCUMENT

Note 7 - Goodwill and Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2015	Mar. 31, 2017	Mar. 31, 2016
Goodwill		$ 56,024	$ 41,137
Accumulated impairment losses		(13,192)	(13,192)
Accumulated currency translation adjustment		(477)	(570)
Net goodwill at beginning of year		42,355	27,375
Goodwill acquired in acquisition	$ 14,900		14,887
Currency translation adjustment		(128)	93
Net goodwill at end of year		$ 42,227	$ 42,355

XML 78 R65.htm IDEA: XBRL DOCUMENT

Note 7 - Goodwill and Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Net intangible assets	$ 2,984	$ 7,607
Gross intangible assets	40,937	40,945
Accumulated Impairment	1,391
Accumulated amortization	36,562	33,338
Developed Technology Rights [Member]
Net intangible assets	2,876	5,670
Gross intangible assets	17,309	17,309
Accumulated Impairment	265
Accumulated amortization	14,168	11,639
Customer Relationships [Member]
Net intangible assets		559
Gross intangible assets	13,520	13,520
Accumulated Impairment	123
Accumulated amortization	13,397	12,961
In Process Research and Development [Member]
Net intangible assets		1,188
Gross intangible assets	1,188	1,188
Accumulated Impairment	1,003
Accumulated amortization	185
Contract Backlog [Member]
Net intangible assets
Gross intangible assets	7,329	7,329
Accumulated Impairment
Accumulated amortization	7,329	7,329
Other Intangible Assets [Member]
Net intangible assets	108	190
Gross intangible assets	1,591	1,599
Accumulated Impairment
Accumulated amortization	$ 1,483	$ 1,409

XML 79 R66.htm IDEA: XBRL DOCUMENT

Note 7 - Goodwill and Intangible Assets - Acquired Intangibles (Details) - USD ($)
$ in Thousands

May 01, 2015

Jun. 27, 2013

Customer Relationships [Member]

$ 2,867

Finite-Lived Intangible Assets, Amortization Method

$ 500

Accelerated

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

3 years

In Process Research and Development [Member]

Finite-Lived Intangible Assets, Amortization Method

^[1]

$ 1,188

Straight-line

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

^[1]

5 years

RadioPulse [Member]

RadioPulse [Member] | Intellectual Property [Member]

$ 2,867

Finite-Lived Intangible Assets, Amortization Method

$ 1,005

Accelerated

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

5 years

RadioPulse [Member] | Customer Relationships [Member]

Finite-Lived Intangible Assets, Amortization Method

$ 500

Accelerated

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

3 years

RadioPulse [Member] | In Process Research and Development [Member]

Finite-Lived Intangible Assets, Amortization Method

$ 1,188

Straight-line

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

5 years

RadioPulse [Member] | Contract Backlog [Member]

Finite-Lived Intangible Assets, Amortization Method

$ 174

Straight-line

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

180 days

Acquired MCU Business [Member]

Acquired MCU Business [Member] | Intellectual Property [Member]

$ 24,000

Finite-Lived Intangible Assets, Amortization Method

$ 11,504

Straight-line

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

5 years

Acquired MCU Business [Member] | Customer Relationships [Member]

Finite-Lived Intangible Assets, Amortization Method

$ 6,920

Accelerated

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

3 years

Acquired MCU Business [Member] | Contract Backlog [Member]

Finite-Lived Intangible Assets, Amortization Method

$ 5,155

Straight-line

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

270 days

Acquired MCU Business [Member] | Trade Names [Member]

Finite-Lived Intangible Assets, Amortization Method

$ 421

Straight-line

Acquired Finite-Lived Intangible Assets, Estimated Useful Life (Month)

5 years

[1]	Amortization started in the quarter ended December 31, 2016 upon the completion of the research and development activities of the corresponding projects.

XML 80 R67.htm IDEA: XBRL DOCUMENT

Note 8 - Borrowing Arrangements (Details Textual)
€ in Thousands, $ in Thousands

1 Months Ended

4 Months Ended

8 Months Ended

12 Months Ended

Nov. 20, 2015

USD ($)

Dec. 31, 2016

USD ($)

Apr. 30, 2015

USD ($)

Mar. 31, 2017

USD ($)

Nov. 30, 2016

Mar. 31, 2017

USD ($)

Mar. 31, 2017

EUR (€)

Mar. 31, 2017

EUR (€)

Mar. 31, 2016

USD ($)

Apr. 30, 2015

EUR (€)

Long-term Debt, Gross

^[1]

$ 76,791

Debt Issuance Costs, Net

399

April 2015 IKB Deutsche Industriebank Loan Payable [Member]

Debt Instrument, Face Amount

$ 7,200

€ 6,500

Debt Instrument, Interest Rate, Stated Percentage

1.75%

Debt Instrument, Periodic Payment, Principal

248

€ 232

Security Deposit

1,100

€ 1,000

Long-term Debt, Gross

5,000

€ 4,600

Debt Instrument, Maturity Date

Mar. 31, 2022

Security Deposit, Maturity Date

Dec. 29, 2017

Notes Payable, Other Payables [Member]

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt

288

$ 1,100

Bank of West Amended and Restated Credit Agreement November 20, 2015 [Member]

Long-term Line of Credit

72,600

80,000

Line of Credit Facility, Maximum Borrowing Capacity

$ 125,000

Line of Credit, Leverage Ratio

Debt Issuance Costs, Net

399

$ 304

Line of Credit Facility, Initiation Date

Nov. 20, 2015

Bank of West Amended and Restated Credit Agreement December, 2016 [Member]

Available Credit Line for Letter of Credit

$ 10,000

Line of Credit Facility, Interest Rate at Period End

2.85%

Line of Credit, Leverage Ratio

2.5

Debt Issuance Costs, Gross

$ 281

Line of Credit Facility, Expiration Date

Nov. 20, 2019

Bank of West Amended and Restated Credit Agreement December, 2016 [Member] | Minimum [Member]

Line of Credit Facility Basis Spread on Variable Rate

0.75%

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage

0.25%

Bank of West Amended and Restated Credit Agreement December, 2016 [Member] | Maximum [Member]

Line of Credit Facility Basis Spread on Variable Rate

2.50%

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage

0.625%

[1]	Includes approximately $399,000 of unamortized debt issuance cost.

XML 81 R68.htm IDEA: XBRL DOCUMENT

Note 8 - Borrowing Arrangements - Aggregate Debt Maturities (Details) - USD ($)
$ in Thousands

Mar. 31, 2017

Mar. 31, 2016

$ 1,058

1,047

73,648

1,048

1,048

77,849

Less: current portion

1,058

$ 1,804

Long-term portion (1)

^[1]

$ 76,791

[1]	Includes approximately $399,000 of unamortized debt issuance cost.

XML 82 R69.htm IDEA: XBRL DOCUMENT

Note 9 - Pension Plans (Details Textual) $ in Thousands	Mar. 31, 2017 USD ($)
Number of Defined Benefit Plans	3
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	$ 397
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 948
Pension Plan [Member] \| Foreign Plan [Member] \| GERMANY
Defined Benefit Plan Percentage of Accrued Pension Liability By Each Plan	73.00%
Pension Plan [Member] \| Foreign Plan [Member] \| UNITED KINGDOM
Defined Benefit Plan Percentage of Accrued Pension Liability By Each Plan	25.00%
Pension Plan [Member] \| Foreign Plan [Member] \| UNITED KINGDOM \| Diversified Growth Fund [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	50.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%
Pension Plan [Member] \| Foreign Plan [Member] \| UNITED KINGDOM \| Debt Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	50.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%
Pension Plan [Member] \| Foreign Plan [Member] \| PHILIPPINES \| Fixed Income Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	75.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	75.00%
Pension Plan [Member] \| Foreign Plan [Member] \| PHILIPPINES \| Equity Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	19.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%
Pension Plan [Member] \| Foreign Plan [Member] \| PHILIPPINES \| Cash [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	6.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5.00%

XML 83 R70.htm IDEA: XBRL DOCUMENT

Note 9 - Pension Plans - Net Periodic Pension Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Service cost	$ 109	$ 101	$ 104
Interest cost	1,313	1,450	1,803
Expected return on plan assets	(1,183)	(1,721)	(1,910)
Recognized actuarial loss	387	438	179
Net periodic pension expense	$ 626	$ 268	$ 176

XML 84 R71.htm IDEA: XBRL DOCUMENT

Note 9 - Pension Plans - Net Amount Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2017	Mar. 31, 2016
Change in projected benefit obligation:
Projected benefit obligation at the beginning of the year	$ 45,021	$ 47,346
Service cost	109	101	$ 104
Interest cost	1,313	1,450	1,803
Actuarial (gain) loss	3,356	(1,549)
Benefits paid	(1,543)	(1,830)
Foreign currency adjustment	(5,073)	(497)
Projected benefit obligation at year end	43,183	45,021	47,346
Change in plan assets:
Fair value of plan assets at the beginning of the year	28,714	30,114
Actual return (loss) on plan assets	3,526	(156)
Employer contribution	993	1,009
Benefits paid from assets	(1,083)	(1,388)
Foreign currency adjustment	(3,868)	(865)
Plan assets at fair value at year end	28,282	28,714	30,114
Unfunded status of the plan at year end				$ 14,901	$ 16,307
Pension liability recognized on the balance sheet due after one year				14,901	16,307
Plans with projected benefit obligation and accumulated benefit obligation in excess of plan assets:
Projected benefit obligation at year end				43,183	45,021
Accumulated benefit obligation at year end				42,652	44,509
Plan assets at fair value at year end	$ 28,714	$ 28,714	$ 30,114	28,282	28,714
Amounts recognized in accumulated other comprehensive income (loss):
Unrecognized actuarial loss, before tax				(11,457)	(12,140)
Amount recognized as component of stockholders’ equity – pretax				(11,457)	(12,140)
Accumulated benefit obligation at year end				$ 42,652	$ 44,509

XML 85 R72.htm IDEA: XBRL DOCUMENT

Note 9 - Pension Plans - Assumptions Used in Calculations (Details)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Salary scale	5.00%	5.00%
Minimum [Member]
Discount rate	1.90%	1.90%
Expected long term rate of return on assets	3.80%	4.40%
Maximum [Member]
Discount rate	5.20%	4.60%
Expected long term rate of return on assets	6.00%	7.00%

XML 86 R73.htm IDEA: XBRL DOCUMENT

Note 9 - Pension Plans - Information on Plan Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan, Fair Value of Plan Assets	$ 28,282	$ 28,714	$ 30,114
Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	136	121
Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	314	351
Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,261	1,321
Mutual Fund [Member]
Defined Benefit Plan, Fair Value of Plan Assets	26,571	26,921
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	14,834	15,224
Fair Value, Inputs, Level 1 [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	136	121
Fair Value, Inputs, Level 1 [Member] \| Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	314	351
Fair Value, Inputs, Level 1 [Member] \| Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,203	1,225
Fair Value, Inputs, Level 1 [Member] \| Mutual Fund [Member]
Defined Benefit Plan, Fair Value of Plan Assets	13,181	13,527
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	13,448	13,490
Fair Value, Inputs, Level 2 [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] \| Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] \| Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	58	96
Fair Value, Inputs, Level 2 [Member] \| Mutual Fund [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 13,390	$ 13,394

XML 87 R74.htm IDEA: XBRL DOCUMENT

Note 9 - Pension Plans - Estimated Future Benefit Payments (Details) $ in Thousands	Mar. 31, 2017 USD ($)
March 31, 2018	$ 1,525
March 31, 2019	1,561
March 31, 2020	1,632
March 31, 2021	1,660
March 31, 2022	1,611
Five fiscal years ended March 31, 2027	9,449
Total benefit payments for the ten fiscal years ended March 31, 2027	$ 17,438

XML 88 R75.htm IDEA: XBRL DOCUMENT

Note 10 - Employee Equity Incentive Plans (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands

12 Months Ended

May 01, 2015

Mar. 31, 2017

Mar. 31, 2016

Aug. 26, 2016

Mar. 31, 2015

Mar. 31, 2014

Aug. 30, 2013

Sep. 16, 2011

Sep. 10, 2009

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized

$ 6,800

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition

2 years 219 days

Share Price

$ 14.55

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant

1,921,500

637,500

1,747,000

1,930,250

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized

^[1]

2,000,000

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value

$ 2,900

$ 2,800

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number

^[2]

5,085,545

5,234,397

4,942,511

5,201,635

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number

3,300,295

3,619,563

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price

$ 10.34

$ 9.93

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value

$ 13,900

$ 6,000

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term

5 years 255 days

5 years 182 days

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term

4 years 36 days

4 years

RadioPulse [Member]

Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards

$ 249

Plan 2009 [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized

900,000

Plan 2011 [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized

600,000

Plan 2013 [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized

2,000,000

Plan 2016 [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized

2,000,000

Stock Options of Plans Two Thousand and Nine Two Thousand and Eleven Two Thousand and Thirteen and Two Thousand and Sixteen [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period

10 years

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

4 years

Stock Options of Plans Two Thousand and Nine Two Thousand and Eleven Two Thousand and Thirteen and Two Thousand and Sixteen [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent

100.00%

Stock Appreciation Rights of Plans Two Thousand and Nine Two Thousand and Eleven Two Thousand and Thirteen and Two Thousand and Sixteen [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent

100.00%

Stock Appreciation Rights of Plans Two Thousand and Nine Two Thousand and Eleven Two Thousand and Thirteen and Two Thousand and Sixteen [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period

10 years

Employee Stock Purchase Plan 1999 [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period

10 years

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

4 years

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized

1,550,000

Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent

85.00%

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate

15.00%

Stock Issued During Period, Shares, Employee Stock Purchase Plans

112,171

Common Stock, Capital Shares Reserved for Future Issuance

128,070

Zilog 2004 Plan [Member]

Share-based Compensation Arrangement By Share-based Payment Award Number of Shares Assumed

652,963

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant

Zilog 2004 Plan [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent

100.00%

Zilog 2002 Plan [Member]

Share-based Compensation Arrangement By Share-based Payment Award Number of Shares Assumed

366,589

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period

10 years

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant

[1]	On August 26, 2016, our stockholders approved the 2016 Plan, under which 2,000,000 shares of our common stock are reserved for the grant of stock options and other equity incentives.
[2]	The number of stock options exercised includes shares that were withheld on behalf of employees to satisfy the statutory tax withholding requirements.

XML 89 R76.htm IDEA: XBRL DOCUMENT

Note 10 - Employee Equity Incentive Plans - Stock-based Compensation in Income Tax Provision (Details) - USD ($)
$ in Thousands

12 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Mar. 31, 2015

Stock-based Compensation Effect in Income before Taxes

$ 3,438

$ 3,592

$ 2,867

Provision for income tax

694

660

1,009

Net stock-based compensation effects on net income

2,744

2,932

1,858

Cost of Sales [Member]

Stock-based Compensation Effect in Income before Taxes

362

488

433

Research and Development Expense [Member]

Stock-based Compensation Effect in Income before Taxes

^[1]

1,144

1,272

814

Selling, General and Administrative Expenses [Member]

Stock-based Compensation Effect in Income before Taxes

$ 1,932

$ 1,832

$ 1,620

[1]	Includes acquisition-related compensation expenses of $249,000 during fiscal 2016.

XML 90 R77.htm IDEA: XBRL DOCUMENT

Note 10 - Employee Equity Incentive Plans - Fair Value and Assumptions (Details) - $ / shares

12 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Mar. 31, 2015

Employee Stock Option [Member]

Weighted average estimated fair value of grant per share (in dollars per share)

$ 4.48

$ 4.83

^[1]

$ 5.54

Risk-free interest rate

1.60%

1.80%

^[1]

1.80%

Expected term in years (Year)

6 years 149 days

6 years 164 days

^[1]

6 years 91 days

Volatility

40.60%

44.90%

^[1]

52.20%

Dividend yield

0.40%

^[2]

1.20%

^[1]

1.00%

^[2]

Employee Stock Purchase Plan 1999 [Member]

Weighted average estimated fair value of grant per share (in dollars per share)

$ 3.28

$ 3.33

^[3]

$ 2.90

^[3]

Risk-free interest rate

0.40%

0.10%

^[3]

0.10%

^[3]

Expected term in years (Year)

273 days

182 days

^[3]

182 days

^[3]

Volatility

37.50%

39.80%

^[3]

36.90%

^[3]

Dividend yield

0.70%

1.10%

^[2],[3]

1.10%

^[3]

[1]	No stock options were granted during the quarter ended December 31, 2015.
[2]	No dividends were declared for the quarters ended September 30, 2016 and December 31, 2016.
[3]	Under the stock purchase plan, rights to purchase shares are only granted during the first and third quarters of each fiscal year.

XML 91 R78.htm IDEA: XBRL DOCUMENT

Note 10 - Employee Equity Incentive Plans - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands

12 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Mar. 31, 2015

Mar. 31, 2014

Shares available for grant, beginning balance (in shares)

637,500

1,747,000

1,930,250

Options outstanding, beginning balance (in shares)

^[1]

5,234,397

4,942,511

5,201,635

Weighted average exercise price per share, beginning balance (in dollars per share)

$ 10.40

$ 10.37

$ 10.22

Options outstanding, intrinsic value

^[2]

$ 19,570

$ 6,456

$ 10,831

$ 8,658

New shares authorized (3) (in shares)

^[3]

2,000,000

Shares available for grant, options granted (in shares)

(746,000)

(1,124,000)

(249,000)

Options granted (in shares)

^[1]

746,000

1,124,000

249,000

Weighted average exercise price per share, options granted (in dollars per share)

$ 11.06

$ 11.72

$ 11.83

Options exercised (in shares)

^[1]

(859,852)

(382,826)

(339,374)

Options exercised, intrinsic value

^[2]

$ 3,112

$ 1,551

$ 1,310

Weighted average exercise price per share, options exercised (in dollars per share)

$ 9.10

$ 9.02

$ 8.62

Shares available for grant, options cancelled (in shares)

7,500

14,500

39,750

Options cancelled (in shares)

^[1]

(7,500)

(14,500)

(94,250)

Weighted average exercise price per share, options cancelled (in dollars per share)

$ 13.37

$ 11.31

$ 11.46

Shares available for grant, options expired (in shares)

22,500

26,000

Options expired (in shares)

^[1]

(27,500)

(434,788)

(74,500)

Weighted average exercise price per share, options expired (in dollars per share)

$ 11.81

$ 14.68

$ 11.17

Shares available for grant, ending balance (in shares)

1,921,500

637,500

1,747,000

Options outstanding, ending balance (in shares)

^[1]

5,085,545

5,234,397

4,942,511

Weighted average exercise price per share, ending balance (in dollars per share)

$ 10.70

$ 10.40

$ 10.37

[1]	The number of stock options exercised includes shares that were withheld on behalf of employees to satisfy the statutory tax withholding requirements.
[2]	Except for options exercised, these amounts represent the difference between the exercise price and $14.55 per share, the closing price of our stock on March 31, 2017 as reported on the NASDAQ Global Select Market, for all in-the-money, outstanding and exercisable options.
[3]	On August 26, 2016, our stockholders approved the 2016 Plan, under which 2,000,000 shares of our common stock are reserved for the grant of stock options and other equity incentives.

XML 92 R79.htm IDEA: XBRL DOCUMENT

Note 10 - Employee Equity Incentive Plans - Stock Options by Exercise Price Range (Details) - $ / shares

12 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Mar. 31, 2015

Mar. 31, 2014

Options outstanding, weighted average contractual life (Year)

5 years 255 days

5 years 182 days

Options outstanding, weighted average exercise price per share (in dollars per share)

$ 10.70

$ 10.40

$ 10.37

$ 10.22

Options exercisable, number of shares exercisable (in shares)

3,300,295

3,619,563

Options exercisable weighted average exercise price per share (in dollars per share)

$ 10.34

$ 9.93

Exercise price range, lower limit (in dollars per share)

5.01

Exercise price range, upper limit (in dollars per share)

$ 14.50

$ 13.37

Options outstanding, number of shares outstanding (in shares)

^[1]

5,085,545

5,234,397

4,942,511

5,201,635

Exercise Price Range 1 [Member]

Options outstanding, weighted average contractual life (Year)

1 year 219 days

2 years 219 days

Options outstanding, weighted average exercise price per share (in dollars per share)

$ 6.66

$ 6.63

Options exercisable, number of shares exercisable (in shares)

576,500

819,897

Options exercisable weighted average exercise price per share (in dollars per share)

$ 6.66

$ 6.63

Exercise price range, lower limit (in dollars per share)

5.01

Exercise price range, upper limit (in dollars per share)

$ 7.75

Options outstanding, number of shares outstanding (in shares)

576,500

819,897

Exercise Price Range 2 [Member]

Options outstanding, weighted average contractual life (Year)

4 years 255 days

4 years 292 days

Options outstanding, weighted average exercise price per share (in dollars per share)

$ 9.30

$ 9.33

Options exercisable, number of shares exercisable (in shares)

783,545

1,017,750

Options exercisable weighted average exercise price per share (in dollars per share)

$ 9.30

$ 9.29

Exercise price range, lower limit (in dollars per share)

7.76

Exercise price range, upper limit (in dollars per share)

$ 10

Options outstanding, number of shares outstanding (in shares)

843,295

1,223,500

Exercise Price Range 3 [Member]

Options outstanding, weighted average contractual life (Year)

6 years 328 days

6 years 219 days

Options outstanding, weighted average exercise price per share (in dollars per share)

$ 11.31

$ 11.42

Options exercisable, number of shares exercisable (in shares)

1,417,000

1,331,916

Options exercisable weighted average exercise price per share (in dollars per share)

$ 11.51

$ 11.52

Exercise price range, lower limit (in dollars per share)

10.01

Exercise price range, upper limit (in dollars per share)

$ 12.50

Options outstanding, number of shares outstanding (in shares)

2,890,750

2,448,000

Exercise Price Range 4 [Member]

Options outstanding, weighted average contractual life (Year)

5 years 146 days

6 years 36 days

Options outstanding, weighted average exercise price per share (in dollars per share)

$ 12.95

$ 12.96

Options exercisable, number of shares exercisable (in shares)

523,250

450,000

Options exercisable weighted average exercise price per share (in dollars per share)

$ 12.78

$ 12.69

Exercise price range, lower limit (in dollars per share)

12.51

Exercise price range, upper limit (in dollars per share)

$ 14.50

$ 13.37

Options outstanding, number of shares outstanding (in shares)

775,000

743,000

[1]	The number of stock options exercised includes shares that were withheld on behalf of employees to satisfy the statutory tax withholding requirements.

XML 93 R80.htm IDEA: XBRL DOCUMENT

Note 11 - Accumulated Other Comprehensive Income (Loss) - AOCI Change (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Balance	$ 279,295	$ 267,301	$ 270,632
Other Comprehensive Income (Loss)	(8,279)	2,822	(28,117)
Balance	297,855	279,295	267,301
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(10,639)	(13,577)	10,535
Other comprehensive income (loss) before reclassifications	(8,594)	2,938	(24,112)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)
Other Comprehensive Income (Loss)	(8,594)	2,938	(24,112)
Balance	(19,233)	(10,639)	(13,577)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance	(82)	7	325
Other comprehensive income (loss) before reclassifications	(106)	(362)	(1,536)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)	(31)	273	1,218
Other Comprehensive Income (Loss)	(137)	(89)	(318)
Balance	(219)	(82)	7
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(9,545)	(9,518)	(5,831)
Other comprehensive income (loss) before reclassifications	196	(71)	(3,830)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)	256	44	143
Other Comprehensive Income (Loss)	452	(27)	(3,687)
Balance	(9,093)	(9,545)	(9,518)
AOCI Attributable to Parent [Member]
Balance	(20,266)	(23,088)	5,029
Other comprehensive income (loss) before reclassifications	(8,504)	2,505	(29,478)
Net gain (loss) reclassified from accumulated other comprehensive income (loss)	225	317	1,361
Other Comprehensive Income (Loss)	(8,279)	2,822	(28,117)
Balance	$ (28,545)	$ (20,266)	$ (23,088)

XML 94 R81.htm IDEA: XBRL DOCUMENT

Note 11 - Accumulated Other Comprehensive (Loss) - AOCI Reclass (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

^[1]

Dec. 31, 2015

^[1]

Sep. 30, 2015

^[1]

Jun. 30, 2015

^[1]

Mar. 31, 2017

Mar. 31, 2016

Mar. 31, 2015

Other income (expense), net

$ 2,328

$ (915)

$ 4,077

Recognized actuarial loss

216,541

217,451

236,802

Income before Income Tax Provision

28,900

23,489

30,430

Tax impact

(7,552)

(8,748)

(6,690)

Total reclassifications for the year

$ 9,294

$ 5,100

$ 3,935

$ 3,019

$ 6,197

$ 2,286

$ 3,273

$ 2,985

21,348

14,741

23,740

Reclassification out of Accumulated Other Comprehensive Income [Member]

Income before Income Tax Provision

(337)

(892)

(2,052)

Tax impact

112

575

691

Total reclassifications for the year

(225)

(317)

(1,361)

Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]

Other income (expense), net

201

(1)

Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]

Other income (expense), net

(151)

(454)

(1,903)

Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]

Recognized actuarial loss

$ (387)

$ (437)

$ (179)

[1]

During the fiscal year ended March 31, 2016, we recorded out-of-period adjustments that increased the income tax provision by a net amount of $1.4 million. See Note 16, "Income Taxes" in the Notes to Consolidated Financial Statements in Item 8 of this Annual Report on Form 10-K for further discussion of an out-of-period adjustment during the quarter ended December 31, 2015.

XML 95 R82.htm IDEA: XBRL DOCUMENT

Note 12 - Computation of Earnings Per Share (Details Textual) - $ / shares	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Weighted Average Number Diluted Shares Outstanding Adjustment	704,000	802,000	708,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,945,238	1,943,420	2,357,772
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Exercise Price	$ 11.79	$ 12.02	$ 12.24

XML 96 R83.htm IDEA: XBRL DOCUMENT

Note 12 - Computation of Earnings Per Share - Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2017

Mar. 31, 2016

Mar. 31, 2015

Weighted average shares - basic (in shares)

$ 9,294

$ 5,100

$ 3,935

$ 3,019

$ 6,197

^[1]

$ 2,286

^[1]

$ 3,273

^[1]

$ 2,985

^[1]

$ 21,348

$ 14,741

$ 23,740

31,724

31,558

31,490

31,401

31,441

31,487

31,651

31,746

31,544

31,579

31,531

Weighted average shares - diluted (in shares)

32,635

32,209

32,145

32,001

32,076

32,343

32,380

32,733

32,248

32,381

32,239

Net income per share - basic (in dollars per share)

$ 0.29

^[2]

$ 0.16

^[2]

$ 0.12

^[2]

$ 0.10

^[2]

$ 0.20

^[2]

$ 0.07

^[2]

$ 0.10

^[2]

$ 0.09

^[2]

$ 0.68

$ 0.47

$ 0.75

Net income per share - diluted (in dollars per share)

$ 0.28

^[2]

$ 0.16

^[2]

$ 0.12

^[2]

$ 0.09

^[2]

$ 0.19

^[2]

$ 0.07

^[2]

$ 0.10

^[2]

$ 0.09

^[2]

$ 0.66

$ 0.46

$ 0.74

[1]	During the fiscal year ended March 31, 2016, we recorded out-of-period adjustments that increased the income tax provision by a net amount of $1.4 million. See Note 16, "Income Taxes" in the Notes to Consolidated Financial Statements in Item 8 of this Annual Report on Form 10-K for further discussion of an out-of-period adjustment during the quarter ended December 31, 2015.
[2]	The sum of the four quarterly calculations of net income per share is not equal to the annual net income per share due to the use of quarterly weighted average shares used to determine the quarterly net income per share as compared to the annual weighted average shares used to determine the annual net income per share.

XML 97 R84.htm IDEA: XBRL DOCUMENT

Note 13 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Dec. 12, 2014
Equity Method Investments	$ 11,589	$ 10,977
Powersem GmbH [Member]
Related Party Transaction, Expenses from Transactions with Related Party	3,900	3,400	$ 4,000
Accounts Receivable, Related Parties	96	99
Accounts Payable, Related Parties	72	63
Equity Method Investments	$ 2,500	2,500
Equity Method Investment, Ownership Percentage	45.00%
Revenue from Related Parties	$ 1,600	1,500	1,800
EB Tech Ltd [Member]
Related Party Transaction, Expenses from Transactions with Related Party	347	378	$ 278
Accounts Payable, Related Parties	35	26
Equity Method Investments	$ 2,600	2,700
Equity Method Investment, Ownership Percentage	20.00%
ATEC [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 7,800	8,000
Accounts Payable, Related Parties	996	737
Equity Method Investments	$ 6,500	$ 5,700
Equity Method Investment, Ownership Percentage				24.00%

XML 98 R85.htm IDEA: XBRL DOCUMENT

Note 14 - Employee Savings and Retirement Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Plan 401(k) [Member]
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 606	$ 616	$ 615
Westcode Semiconductor Group Personal Pension [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	7.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 241	$ 278	$ 287
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	4.50%

XML 99 R86.htm IDEA: XBRL DOCUMENT

Note 15 - Segment and Geographic Information (Details Textual)	12 Months Ended
	Mar. 31, 2017
Number of Operating Segments	1
Number of Reportable Segments	1

XML 100 R87.htm IDEA: XBRL DOCUMENT

Note 15 - Segment and Geographic Information - Segment and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Net Revenues	$ 83,372	$ 79,484	$ 78,629	$ 80,638	$ 79,772	$ 75,133	$ 80,257	$ 82,047	$ 322,123	$ 317,209	$ 338,767
UNITED STATES
Net Revenues									81,499	75,994	85,314
Austria [Member]
Net Revenues									2,313	1,836	2,290
FINLAND
Net Revenues									2,178	1,899	1,669
FRANCE
Net Revenues									9,553	9,076	7,917
GERMANY
Net Revenues									37,919	33,215	32,866
HUNGARY
Net Revenues									1,942	2,082	2,571
ITALY
Net Revenues									4,091	4,328	4,645
NETHERLANDS
Net Revenues									4,488	3,608	2,315
RUSSIAN FEDERATION
Net Revenues									1,263	4,773	5,051
SWEDEN
Net Revenues									1,694	2,155	4,460
SWITZERLAND
Net Revenues									2,311	2,789	2,569
TURKEY
Net Revenues									1,929	2,376	2,658
UNITED KINGDOM
Net Revenues									14,042	13,502	19,832
Other Europe and the Middle East Regions [Member]
Net Revenues									10,097	10,700	11,259
CHINA
Net Revenues									84,447	79,575	83,597
INDONESIA
Net Revenues									2,160	2,128	3,224
JAPAN
Net Revenues									6,995	9,271	8,469
MALAYSIA [Member]
Net Revenues									4,692	4,662	5,580
SINGAPORE
Net Revenues									13,509	12,353	11,694
KOREA, REPUBLIC OF
Net Revenues									19,282	23,215	22,371
TAIWAN, PROVINCE OF CHINA
Net Revenues									2,051	3,151	2,688
THAILAND
Net Revenues									3,547	3,904	4,300
Other Asia Pacific Regions [Member]
Net Revenues									1,557	1,929	1,148
INDIA
Net Revenues									4,315	4,293	5,163
Other Rest of the World [Member]
Net Revenues									$ 4,249	$ 4,395	$ 5,117

XML 101 R88.htm IDEA: XBRL DOCUMENT

Note 15 - Segment and Geographic Information - Revenue by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Net Revenues	$ 83,372	$ 79,484	$ 78,629	$ 80,638	$ 79,772	$ 75,133	$ 80,257	$ 82,047	$ 322,123	$ 317,209	$ 338,767
Power Semiconductors [Member]
Net Revenues									221,312	213,347	219,445
Integrated Circuits [Member]
Net Revenues									82,067	84,078	95,547
Systems and RF Power Semiconductors [Member]
Net Revenues									$ 18,744	$ 19,784	$ 23,775

XML 102 R89.htm IDEA: XBRL DOCUMENT

Note 15 - Segment and Geographic Information - Customer Concentration Risk (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Sales Revenue, Net [Member] \| Distributor 1 [Member]
Concentration risk, percentage	12.30%	12.20%	10.20%
Sales Revenue, Net [Member] \| Distributor 2 [Member]
Concentration risk, percentage	10.80%		10.50%
Accounts Receivable [Member] \| Distributor 1 [Member]
Concentration risk, percentage	15.20%	18.20%
Accounts Receivable [Member] \| Distributor 3 [Member]
Concentration risk, percentage	10.50%

XML 103 R90.htm IDEA: XBRL DOCUMENT

Note 15 - Segment and Geographic Information - Summary of Net Revenues, Net Income of Domestic and Foreign Operations (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2017

Mar. 31, 2016

Mar. 31, 2015

$ 83,372

$ 79,484

$ 78,629

$ 80,638

$ 79,772

$ 75,133

$ 80,257

$ 82,047

$ 322,123

$ 317,209

$ 338,767

$ 9,294

$ 5,100

$ 3,935

$ 3,019

$ 6,197

^[1]

$ 2,286

^[1]

$ 3,273

^[1]

$ 2,985

^[1]

21,348

14,741

23,740

Foreign [Member]

148,159

159,984

188,964

17,172

11,039

21,379

Domestic [Member]

173,964

157,225

149,803

$ 4,176

$ 3,702

$ 2,361

[1]

XML 104 R91.htm IDEA: XBRL DOCUMENT

Note 15 - Segment and Geographic Information - Long-lived Assets By Geographic Area (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Property, plant and equipment, net	$ 42,240	$ 42,623	$ 42,545
UNITED STATES
Property, plant and equipment, net	25,284	26,792	27,740
GERMANY
Property, plant and equipment, net	15,594	14,506	13,228
Other Geographic Regions [Member]
Property, plant and equipment, net	$ 1,362	$ 1,325	$ 1,577

XML 105 R92.htm IDEA: XBRL DOCUMENT

Note 16 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Effective Income Tax Rate Reconciliation, Percent	26.00%	37.00%	22.00%
Effective Income Tax Rate Reconciliation, Out of Period Adjustments, Percent		6.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,100	$ (436)
Operating Loss Carryforwards, Valuation Allowance	16,400
Unrecognized Tax Benefits	6,443	6,946	$ 6,952	$ 6,978
Unrecognized Tax Benefits, Period Increase (Decrease)	(503)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	952
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Reversal	94
Unrecognized Tax Benefits, Increase (Decrease) in Income Tax Penalties and Interest Accrued	438
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Reversal During Period	532
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3,000	4,100
Undistributed Earnings of Foreign Subsidiaries	150,500
Cash and Cash Equivalents, at Carrying Value	167,904	$ 155,806
Geographic Distribution, Foreign [Member]
Cash and Cash Equivalents, at Carrying Value	74,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards	23,400
Foreign Tax Authority [Member]
Operating Loss Carryforwards	$ 18,600

XML 106 R93.htm IDEA: XBRL DOCUMENT

Note 16 - Income Taxes - Geographical Breakdown Income (Loss) Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Domestic	$ 7,997	$ 9,030	$ 3,390
International	20,903	14,459	27,040
Total	$ 28,900	$ 23,489	$ 30,430

XML 107 R94.htm IDEA: XBRL DOCUMENT

Note 16 - Income Taxes - Income Taxes Provision Breakdown (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Current:
Federal	$ 406	$ 1,418	$ 201
State	(560)	126	83
Foreign	4,532	3,436	5,066
Current Income Tax Expense (Benefit)	4,378	4,980	5,350
Deferred:
Federal	1,867	3,554	945
State	1,256	189	20
Foreign	51	25	375
Deferred Income Tax Expense (Benefit)	3,174	3,768	1,340
Total provision for income tax	$ 7,552	$ 8,748	$ 6,690

XML 108 R95.htm IDEA: XBRL DOCUMENT

Note 16 - Income Taxes - Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Statutory federal income tax rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	1.00%	1.00%	1.00%
Expense (benefit) of lower-tax foreign jurisdictions	(17.00%)	(10.00%)	(15.00%)
Tax credits	(2.00%)	(3.00%)	(1.00%)
Valuation allowances	4.00%	3.00%
Permanent items		(5.00%)
Tax reserves	1.00%
Tax asset write-off	2.00%	10.00%
Foreign income	2.00%	6.00%	2.00%
Effective tax provision rate	26.00%	37.00%	22.00%

XML 109 R96.htm IDEA: XBRL DOCUMENT

Note 16 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Deferred tax assets:
Reserves and allowances	$ 5,504	$ 6,018
Other liabilities and accruals	6,297	6,176
Depreciable assets	404	83
Net operating loss carryforwards	10,236	11,675
Share-based compensation	4,721	5,098
Credits carryforward	2,188	2,440
Total deferred tax assets	29,350	31,490
Less: Valuation allowances and other reserves	(4,611)	(3,466)
Net deferred tax assets	$ 24,739	$ 28,024

XML 110 R97.htm IDEA: XBRL DOCUMENT

Note 16 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Beginning Balance	$ 6,946	$ 6,952	$ 6,978
Lapse of statute of limitations	(1,461)	(772)	(3,070)
Increases in balances related to tax positions taken during prior periods		129	213
Decreases in balances related to tax positions taken during prior periods	(63)
Increases in balances related to tax positions taken during the current period	1,021	637	2,831
Ending Balance	$ 6,443	$ 6,946	$ 6,952

XML 111 R98.htm IDEA: XBRL DOCUMENT

Note 17 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Operating Leases, Rent Expense, Net	$ 1,500	$ 1,600	$ 1,400
Restricted Cash and Cash Equivalents, Current	1,330	$ 277
Foreign Tax Authority [Member] \| Bureau of Internal Revenue [Member] \| Tax Year 2010 [Member]
Loss Contingency, Estimate of Possible Loss	2,500
Foreign Tax Authority [Member] \| Bureau of Internal Revenue [Member] \| Tax Year 2011 [Member]
Loss Contingency, Estimate of Possible Loss	$ 156

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Note 17 - Commitments and Contingencies - Commitments (Details) $ in Thousands	Mar. 31, 2017 USD ($)
Operating Leases, Future Minimum Payments, Current	$ 1,350
Purchase Obligation, Due in Next Twelve Months	23,700
Operating Leases, Future Minimum Payments, Due in Two Years	1,209
Purchase Obligation, Due in Second Year	2,776
Operating Leases, Future Minimum Payments, Due in Three Years	1,087
Purchase Obligation, Due in Third Year	0
Operating Leases, Future Minimum Payments, Due in Four Years	667
Purchase Obligation, Due in Fourth Year	0
Operating Leases, Future Minimum Payments, Due in Five Years	473
Purchase Obligation, Due in Fifth Year	0
Operating Leases, Total Minimum Payments	4,786
Purchase Obligation, Total Minimum Payments	$ 26,476

XML 113 R100.htm IDEA: XBRL DOCUMENT

Selected Quarterly Financial Data (Unaudited) (Details Textual) $ in Millions	12 Months Ended
	Mar. 31, 2016 USD ($)
Tax Adjustments, Settlements, and Unusual Provisions	$ 1.4

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Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2017

Mar. 31, 2016

Mar. 31, 2015

Operating income

$ 9,233

$ 7,819

$ 6,771

$ 5,029

$ 6,834

$ 6,262

$ 7,033

$ 5,704

$ 28,852

$ 25,833

$ 27,510

Net income per share - basic (in dollars per share)

$ 9,294

$ 5,100

$ 3,935

$ 3,019

$ 6,197

^[1]

$ 2,286

^[1]

$ 3,273

^[1]

$ 2,985

^[1]

$ 21,348

$ 14,741

$ 23,740

$ 0.29

^[2]

$ 0.16

^[2]

$ 0.12

^[2]

$ 0.10

^[2]

$ 0.20

^[2]

$ 0.07

^[2]

$ 0.10

^[2]

$ 0.09

^[2]

$ 0.68

$ 0.47

$ 0.75

Net income per share - diluted (in dollars per share)

$ 0.28

^[2]

$ 0.16

^[2]

$ 0.12

^[2]

$ 0.09

^[2]

$ 0.19

^[2]

$ 0.07

^[2]

$ 0.10

^[2]

$ 0.09

^[2]

$ 0.66

$ 0.46

$ 0.74

Weighted average shares - basic (in shares)

31,724

31,558

31,490

31,401

31,441

31,487

31,651

31,746

31,544

31,579

31,531

Weighted average shares - diluted (in shares)

32,635

32,209

32,145

32,001

32,076

32,343

32,380

32,733

32,248

32,381

32,239