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Significant Accounting Policies (Policies)
 12 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash and Cash Equivalents

     We consider all highly liquid investments with maturities of
three
months or less when purchased to be cash equivalents.
Fair Value of Financial Instruments, Policy [Policy Text Block]
Fair Value of Financial Instruments

     The carrying amount of cash and cash equivalents, accounts receivable, and accounts payable approximates fair value because of the short maturity of these instruments. Fair values of marketable securities are based on quoted market prices.
Concentration Of Risk and Financial Instruments Policy [Policy Text Block]
Concentration of Risk and Financial Instruments

     Financial instruments potentially subject to significant concentrations of credit risk consist principally of cash equivalents, marketable securities, and accounts receivable.

     Cash and cash equivalents have been maintained in financial institutions we believe have high credit quality, however these accounts are generally in excess of federally insured amounts.

     We have invested our excess cash in corporate-backed and municipal-backed bonds and money market instruments. Our investment policy prescribes purchases of only high-grade securities, and limits the amount of credit exposure to any
one
issuer. The effects of the COVID-
19
pandemic have degraded outlooks for some of our securities’ issuers, which
may
increase the risk of default on
one
or more securities.

     Our customers are throughout the world. We generally do
not
require collateral from our customers, but we perform ongoing credit evaluations of their financial condition. More information on accounts receivable is contained in the paragraph titled “Accounts Receivable and Allowance for Doubtful Accounts” of this note. The effects of the COVID-
19
pandemic could increase our bad-debt risk in the future.

     Additionally, we are dependent on critical suppliers including our packaging vendors and suppliers of certain raw silicon and semiconductor wafers that are incorporated in our products. The effects of the COVID-
19
pandemic have increased the risk of supply interruptions.
Receivable [Policy Text Block]
Accounts Receivable and Allowance for Doubtful Accounts

     We grant credit to customers in the normal course of business and at times
may
require customers to prepay for an order prior to shipment. Accounts receivable are recorded net of an allowance for doubtful accounts. We make estimates of the uncollectibility of accounts receivable. We specifically analyze accounts receivable, historical bad debts, and customer creditworthiness when evaluating the adequacy of the allowance. We had
no
charges or provisions to our allowance for doubtful accounts in fiscal
2020
or
2019.
Inventory, Policy [Policy Text Block]
Inventories

     Inventories are stated at the lower of cost or net realizable value. Cost is determined by the
first
in,
first
out method. We record inventory reserves when we determine certain inventory is unlikely to be sold based on sales trends, turnover, competition, and other market factors.
Standard Product Warranty, Policy [Policy Text Block]
Product Warranty

     In general we warranty our products to be free from defects in material and workmanship for
one
year.
Property, Plant and Equipment, Policy [Policy Text Block]
Fixed Assets

     Fixed assets are stated at cost. Depreciation of machinery and equipment is recorded over the estimated useful lives of the assets, generally
five
years, using the straight-line method. Amortization of leasehold improvements is recorded using the straight-line method over the lesser of the lease term or
five
-year useful life. We record losses on long-lived assets used in operations when indicators of impairment are present and the undiscounted cash flows estimated to be generated by those assets are less than the assets’ carrying amount. We have
not
identified any indicators of impairment during fiscal
2020
or
2019.
Depreciation and amortization expense related to fixed assets was
$364,409
for fiscal
2020
and
498,813
for fiscal
2019.
Revenue from Contract with Customer [Policy Text Block]
Revenue Recognition

    We recognize revenue when we satisfy performance obligations by the transfer of control of products or services to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those products or services. Revenue is disaggregated into product sales and contract research and development to depict the nature, amount, timing of revenue recognition and economic characteristics of our business, and is represented within the financial statements.

     We recognize revenue from product sales to customers and distributors when we satisfy our performance obligation, at a point in time, upon product shipment or delivery to our customer or distributor as determined by agreed upon shipping terms. Shipping charges billed to customers are included in product sales and the related shipping costs are included in cost of sales. Under certain limited circumstances, our distributors
may
earn commissions for activities unrelated to their purchases of our products, such as for facilitating the sale of custom products or research and development contracts with
third
parties. We recognize any such commissions as selling, general, and administrative expenses. We recognize discounts provided to our distributors as reductions in revenue.

     We recognize contract research and development revenue over a period of time as the performance obligation is satisfied over a period of time rather than a point in time. Contracts have specifications unique to each customer and do
not
create an asset with an alternate use, and we have an enforceable right to payment for performance completed to date. We recognize revenue over a period of time using costs incurred as the measurement of progress towards completion.

     Accounts receivable is recognized when we have transferred a good or service to a customer and our right to receive consideration is unconditional through the completion of our performance obligation. A contract asset is recognized when we have a right to consideration from the transfer of goods or services to a customer but have
not
completed our performance obligation. A contract liability is recognized when we have been paid by a customer but have
not
yet satisfied the performance obligation by transferring goods or services. We had
no
material contract assets or contract liabilities as of
March 31, 2020
or
March 
31,
2019.


     Our performance obligations related to product sales and contract research and development contracts are satisfied in
one
year or less. Unsatisfied performance obligations represent contracts with an original expected duration of
one
year or less. As permitted under Accounting Standards Codification (“ASC”) Topic 
606,
Revenue from Contracts with Customers
, we are using the practical expedient
not
to disclose the value of these unsatisfied performance obligations. We also use the practical expedient in which we do
not
assess whether a contract has a significant financing component if the expectation at contract inception is such that the period between payment by the customer and the transfer of the promised goods or services to the customer will be
one
year or less.
Income Tax, Policy [Policy Text Block]
Income Taxes

     We account for income taxes using the asset and liability method. Deferred income taxes are provided for temporary differences between the financial reporting and tax bases of assets and liabilities. We provide valuation allowances against deferred tax assets if we determine that it is less likely than
not
that we will be able to utilize the deferred tax assets.
Research and Development Expense, Policy [Policy Text Block]
Research and Development Expense Recognition

     Research and development costs are expensed as they are incurred. Customer-sponsored research and development costs are included in cost of sales.
Share-based Payment Arrangement [Policy Text Block]
Stock-Based Compensation

     We measure stock-based compensation cost at the grant date based on the fair value of the award and recognize the compensation expense over the requisite service period, which is generally the vesting period. We recognize any forfeitures as they occur.
Earnings Per Share, Policy [Policy Text Block]
Net Income Per Share

     Net income per basic share is computed based on the weighted-average number of common shares issued and outstanding during each year. Net income per diluted share amounts assume exercise of all stock options. The following table shows the components of diluted shares:
 
   
Year Ended March 31
  
   
2020
    
2019
  
Weighted average common shares outstanding – basic
    
4,845,627
      
4,844,010
  
Dilutive effect of stock options
    
1,667
      
6,557
  
Shares used in computing net income per share – diluted
    
4,847,294
      
4,850,567
  
Use of Estimates, Policy [Policy Text Block]
Use of Estimates

     The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires us to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
 
New Accounting Pronouncements, Policy [Policy Text Block]
Recently Issued Accounting Standards

Recently Adopted Accounting Standards

     In
July 2019,
the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”)
No.
2019
-
07,
Codification Updates to SEC Sections—Amendments to SEC Paragraphs Pursuant to SEC Final Rule Releases
No.
33
-
10532,
Disclosure Update and Simplification, and Nos.
33
-
10231
and
33
-
10442,
Investment Company Reporting Modernization, and Miscellaneous Updates
. ASU
2019
-
07
aligns the guidance in various SEC sections of the codification with the requirements of certain SEC final rules and is effective immediately. These rules include requiring filers to include in their interim financial statements a reconciliation of changes in shareholders’ equity. We adopted all of the applicable rules for our Quarterly Report on Form
10
-Q for the quarter ended
June 
30,
2019
and subsequent interim reports. The adoption of ASU
2019
-
07
only affected presentation and disclosure.

     In
February 2016,
the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”)
No.
 
2016
-
02,
Lease Accounting
. ASU
2016
-
02
requires recognition of lease assets and lease liabilities on the balance sheet of lessees. In
July 2018,
the FASB issued ASU
2018
-
10,
Codification Improvements to Topic
842
(Leases)
, which provides narrow amendments to clarify how to apply certain aspects of the new lease standard. The guidance is effective for fiscal years beginning after
December 
15,
2018,
and interim periods within those fiscal years, which is fiscal
2020
for us. In
July 2018,
the FASB issued ASU
No.
 
2018
-
11,
Leases Topic (
842
): Targeted Improvements.
ASU
No.
 
2018
-
11
provided companies an option to apply the transition provisions of the new lease standard at its adoption date instead of at the earliest comparative period presented in its financial statements, and we adopted the new lease guidance using that method in the quarter ended
June 
30,
2019.
Currently our only lease is the lease for our facility. We recognized
$298,983
of leased liabilities a right-of-use asset of
$261,644
as of
April 1, 2019.
The leased liabilities and right-of-use asset exclude non-lease components. There was
no
effect on our results of operations or cash flows.

New Accounting Standards
Not
Yet Adopted

     In
December 2019,
the FASB issued ASU
No.
2019
-
12,
Income Taxes (Topic
740
)—Simplifying the Accounting for Income Taxes
. ASU 
2019
-
12
is intended to simplify accounting for income taxes. It removes certain exceptions to the general principles in Topic
740
and amends existing guidance to improve consistent application. ASU
2019
-
12
is effective for fiscal years beginning after
December 15, 2020
and interim periods within those fiscal years, which is fiscal
2022
for us, with early adoption permitted. We do
not
expect adoption of the new guidance to have a significant impact on our financial statements.

     In
June 2016,
the FASB issued ASU
No.
 
2016
-
13,
Financial Instruments—Credit Losses (Topic
326
), Measurement of Credit Losses on Financial Statements
. ASU 
2016
-
13
requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. In
November 
2018
the FASB issued ASU
No.
 
2018
-
19,
Codification Improvements to Topic 
326,
Financial Instruments—Credit Losses
, which clarifies codification and corrects unintended application of the guidance, and in
November 2019,
the FASB issued ASU
No.
 
2019
-
11,
Codification Improvements to Topic
326,
Financial Instruments-Credit Losses
, which clarifies or addresses specific issues about certain aspects of ASU 
2016
-
13.
In
November 
2019
the FASB issued ASU
No.
 
2019
-
10,
Financial Instruments—Credit Losses (Topic 
326
), Derivatives and Hedging (Topic
815
), and Leases (Topic 
842
): Effective Dates
, and in
February 2020
the FASB issued ASU
No.
 
2020
-
02,
Financial Instruments—Credit Losses (Topic 
326
) and Leases (Topic
842
): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin
No.
 
119
and Update to SEC Section on Effective Date Related to Accounting Standards Update
No.
 
2016
-
02,
Leases (Topic 
842
)
, both of which delay the effective date of ASU 
2016
-
13
by
three
years for certain Smaller Reporting Companies such as us. In
March 
2020,
the FASB issued ASU
No.
 
2020
-
03,
Codification Improvements to Financial Instruments
; which modifies the measurement of expected credit losses of certain financial instruments. In accordance with ASU 
2019
-
10
and ASU 
2020
-
02,
ASU 
2016
-
13
is effective for certain Smaller Reporting Companies for financial statements issued for fiscal years beginning after
December 
15,
2022
and interim periods within those fiscal years, which will be fiscal
2024
for us if we continue to be classified as a Smaller Reporting Company, with early adoption permitted. We do
not
expect adoption of the new guidance to have a significant impact on our financial statements.