Note 2 - Long-Term Incentive Plans (Tables)

9 Months Ended

Sep. 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 September 30,			Nine Months Ended September 30,
	2012			2013			2012
Expected volatility		73.18	%		76.23	%		71.46	%
Risk-free interest rate		0.52	%		1.06	%		0.56	%
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	$	0.55		$	0.87		$	0.70

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		(57,241	)
Forfeited and cancelled		(203,873	)
Outstanding at September 30, 2013		4,093,159

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 September 30, 2013		-

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Cost of sales	$	2	$	19	$	30	$	57
Research and development		35		82		189		247
Selling, general and administrative		220		139		2,422		415
	$	257	$	240	$	2,641	$	719