Note 10. Stock-Based Awards (Tables)

12 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Fiscal Year Ended March 31,
	2013					2012
	Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price
Outstanding at April 1		6,007,661		$	2.23		6,558,701		$	1.85
Granted		1,019,750			1.25		2,042,950			2.23
Exercised (Note 1)		(87,881	)		1.13		(2,303,340	)		1.16
Canceled		(1,158,922	)		2.18		(290,650	)		2.03
Outstanding at March 31		5,780,608		$	2.09		6,007,661		$	2.23
Vested and expected to vest at March 31		5,622,126		$	2.10		5,581,205		$	2.19
Exercisable at March 31		3,580,173		$	2.34		3,578,986		$	2.19

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			Stock Options Outstanding						Stock Options Exercisable
Range of Exercise Prices			Number of Shares		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price
$0.79	-	$1.16		700,250		7.29	$	1.00		460,625	$	0.99
$1.17	-	$2.32		3,554,833		7.78	$	1.69		1,734,208	$	1.69
$2.33	-	$3.48		471,650		7.58	$	2.63		331,465	$	2.67
$3.49	-	$4.65		893,375		1.02	$	3.72		893,375	$	3.72
$4.66	-	$5.81		160,500		5.16	$	4.88		160,500	$	4.88
				5,780,608		6.59	$	2.09		3,580,173	$	2.34

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Fiscal Year Ended March 31,
	2013					2012
	Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price
Nonvested at April 1		306,606		$	2.50		40,000		$	2.00
Granted		40,000			1.40		406,089			2.53
Vested		(174,284	)		2.30		(50,000	)		2.01
Forfeited		(50,278	)		2.66		(89,483	)		2.65
Nonvested at March 31		122,044		$	2.37		306,606		$	2.50
Vested at March 31		224,284		$	2.23		50,000		$	2.01

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Fiscal Year Ended March 31,
	2013		2012
Risk-free interest rate		1.05%		1.46%
Expected life (in years)		6.43		6.44
Expected volatility		84%		85%
Expected dividend yield		--		--

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Fiscal Year Ended March 31,
	2013		2012
Cost of sales	$	89	$	157
Selling, general, and administrative expenses		1,329		1,798
Research and development expenses		51		63
Total stock-based compensation	$	1,469	$	2,018