Business Segments And Enterprise-Wide Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 OperatingSegments	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of operating segments			2
Sales to external customers	$ 31,609	$ 24,948	$ 89,926	$ 70,662
Gross margin	15,151	11,101	41,913	33,319
Income (loss) from operations	(695)	(1,769)	(2,770)	(20,831)
AMI [Member]
Segment Reporting Information [Line Items]
Sales to external customers	18,510	13,712	51,229	39,553
Gross margin	11,690	8,210	31,291	24,291
Income (loss) from operations	2,841	1,194	6,210	(12,555)
HE [Member]
Segment Reporting Information [Line Items]
Sales to external customers	13,099	11,236	38,697	31,109
Gross margin	3,461	2,891	10,622	9,028
Income (loss) from operations	2,124	1,523	6,557	5,016
Other [Member]
Segment Reporting Information [Line Items]
Sales to external customers	0	0	0	0
Gross margin	0	0	0	0
Income (loss) from operations	$ (5,660)	$ (4,486)	$ (15,537)	$ (13,292)

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Details

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