Note 7. Stock-Based Awards (Tables)

6 Months Ended

Sep. 30, 2012

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

	Number of Shares			Exercise Price Range				Weighted Average Exercise Price		Weighted Average Remaining Contractual Life
Outstanding at March 31, 2012		6,007,661			$0.79	–	$4.88		$2.23		6.9
Granted		862,750			$1.24	–	$1.69		1.28
Exercised		(74,337	)		$0.97	–	$1.35		1.14
Canceled		(504,895	)		$0.79	–	$3.73		2.42
Outstanding at September 30, 2012		6,291,179			$0.85	–	$4.88		$2.10		6.5
Vested and expected to vest at September 30, 2012		6,107,563			$0.85	–	$4.88		$2.11		6.4
Exercisable at September 30, 2012		3,935,994			$0.85	–	$4.88		$2.32		4.8

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

	Number of Shares			Weighted Average Grant Price
Nonvested at March 31, 2012		306,606			$2.50
Granted		40,000			1.40
Vested		(124,723	)		2.46
Forfeited		(44,733	)		2.65
Nonvested at September 30, 2012		177,150			$2.25

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

	Three Months Ended September 30,				Six Months Ended September 30,
	2012		2011		2012		2011
Risk-free interest rate		1.02%		1.17%		1.03%		1.44%
Expected life (in years)		6.4		5.5		6.4		6.0
Expected volatility		85%		88%		84%		87%
Expected dividend yield		--		--		--		--

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

	Three Months Ended September 30,				Six Months Ended September 30,
	2012		2011		2012		2011
Cost of sales	$	22	$	41	$	69	$	81
Selling, general, and administrative expenses		538		857		907		1,277
Research and development expenses		9		13		36		29
Total stock-based compensation expense	$	569	$	911	$	1,012	$	1,387