Note 9 - Stock-Based Awards (Tables)

12 Months Ended

Mar. 31, 2014

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,
	2014					2013
	Number of Shares			Weighted Average Exercise Price		Number of Shares			Weighted Average Exercise Price
Outstanding at April 1		5,780,608		$	2.09		6,007,661		$	2.23
Granted		1,096,500			1.04		1,019,750			1.25
Exercised		-			-		(87,881	)		1.13
Cancelled (1)		(2,499,234	)		2.19		(1,158,922	)		2.18
Outstanding at March 31		4,377,874		$	1.78		5,780,608		$	2.09
Vested and expected to vest at March 31		4,302,138		$	1.79		5,622,126		$	2.10
Exercisable at March 31		3,531,403		$	1.90		3,580,173		$	2.34

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 Exercise Average Price		Number of Shares		Weighted Average Exercise Price
$0.79	-	$1.16		1,591,250		8.07	$	1.00		994,500	$	1.00
$1.17	-	$2.32		1,868,399		4.88	$	1.64		1,710,586	$	1.62
$2.33	-	$3.48		464,350		6.63	$	2.63		372,442	$	2.65
$3.49	-	$4.65		293,375		1.23	$	3.93		293,375	$	3.93
$4.66	-	$5.81		160,500		4.16	$	4.88		160,500	$	4.88
				4,377,874		5.96	$	1.78		3,531,403	$	1.90

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

	Fiscal Year Ended March 31,
	2014					2013
				Weighted					Weighted
				Average					Average
	Number			Grant		Number			Grant
	of Shares			Price		of Shares			Price
Nonvested at April 1		122,044		$	2.37		306,606		$	2.50
Granted		1,365,000			1.00		40,000			1.40
Vested		(161,642	)		1.54		(174,284	)		2.30
Forfeited		-			-		(50,278	)		2.66
Nonvested at March 31		1,325,402		$	1.06		122,044		$	2.37

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

	Fiscal Year Ended March 31,
	2014			2013
Risk-free interest rate		1.27	%		1.05	%
Expected life (in years)		5.47			6.43
Expected volatility		79	%		84	%
Expected dividend yield		--			--

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

	Fiscal Year Ended March 31,
	2014		2013
Cost of sales	$	54	$	89
Selling, general, and administrative expenses(1)		577		1,329
Research and development expenses		63		51
Total stock-based compensation	$	694	$	1,469