Business Segments And Enterprise-Wide Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 OperatingSegments	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of operating segments			2
Sales to external customers	$ 24,948	$ 22,211	$ 70,662	$ 66,471
Gross margin	11,101	10,621	33,319	31,242
Income (loss) from operations	(1,769)	(974)	(20,831)	(1,112)
AMI [Member]
Segment Reporting Information [Line Items]
Sales to external customers	13,712	10,393	39,553	29,775
Gross margin	8,210	6,868	24,291	19,174
Income (loss) from operations	1,194	1,100	(12,555)	3,773
HE [Member]
Segment Reporting Information [Line Items]
Sales to external customers	11,236	11,818	31,109	36,696
Gross margin	2,891	3,753	9,028	12,068
Income (loss) from operations	1,523	2,019	5,016	6,929
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	$ (4,486)	$ (4,093)	$ (13,292)	$ (11,814)

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

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ 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=6880815&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

+ Details

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- Details

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