Note 2 - Long-Term Incentive Plans (Tables)

6 Months Ended

Jun. 30, 2013

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

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

	Three Months Ended June 30,			Six Months Ended June 30,
	2012			2013			2012
Expected volatility		68.49	%		76.23	%		69.44	%
Risk-free interest rate		0.94	%		1.06	%		1.32	%
Expected dividend yield		0.00	%		0.00	%		0.00	%
Expected life (in years)		6.0			6.0			6.0
Estimated fair value per option granted		$0.85			$0.87			$0.97

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

	Number of Options
Outstanding at January 1, 2013		4,294,273
Granted		60,000
Exercised		(52,428	)
Forfeited and cancelled		(112,918	)
Outstanding at June 30, 2013		4,188,927

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

	Shares
Nonvested at January 1, 2013		343,161
Granted		329,164
Vested		(672,325	)
Nonvested at June 30, 2013		-

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Cost of sales	$	11	$	19	$	28	$	38
Research and development		67		69		154		165
Selling, general and administrative		1,966		87		2,202		276
	$	2,044	$	175	$	2,384	$	479