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7. STOCK- BASED COMPENSATION (Details 3) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock-based compensation expense by line item
Stock-based compensation expense	$ 571,000	$ 563,000	$ 1,144,000	$ 1,128,000
Other information
Income tax benefit recognized from allocation of share-based compensation expense	0	29,000	0	46,000
windfall tax benefits recognized	0	226,000	0	403,000
Unrecognized compensation costs	3,900,000		3,900,000
Weighted average period of recognition of unrecognized compensation costs	2 years 1 month 21 days
Cost of Sales [Member]
Stock-based compensation expense by line item
Stock-based compensation expense	104,000	102,000	204,000	196,000
Research and Development Expense [Member]
Stock-based compensation expense by line item
Stock-based compensation expense	248,000	232,000	489,000	490,000
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense by line item
Stock-based compensation expense	$ 219,000	$ 229,000	$ 451,000	$ 442,000

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Section S99

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

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X

- Definition

Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 20

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X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

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X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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