Business Segments And Enterprise-Wide Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 OperatingSegments	Sep. 30, 2011
Segment Reporting Information [Line Items]
Number of operating segments			2
Sales to external customers	$ 22,491	$ 21,852	$ 45,714	$ 44,260
Gross margin	10,706	10,361	22,218	20,621
Income (loss) from operations	(18,418)	(383)	(19,062)	(137)
AMI [Member]
Segment Reporting Information [Line Items]
Sales to external customers	13,230	9,786	25,841	19,382
Gross margin	7,764	6,144	16,081	12,306
Income (loss) from operations	(15,691)	886	(13,749)	2,673
HE [Member]
Segment Reporting Information [Line Items]
Sales to external customers	9,261	12,066	19,873	24,878
Gross margin	2,942	4,217	6,137	8,315
Income (loss) from operations	1,694	2,561	3,493	4,910
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	$ (4,421)	$ (3,830)	$ (8,806)	$ (7,720)

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

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- Details

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