Note 2 - Long-Term Incentive Plans (Tables)

9 Months Ended

Sep. 30, 2014

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

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

	Nine Months
	Ended September 30,
	2014			2013
Expected volatility		78.78	%		76.23	%
Risk-free interest rate		1.91	%		1.06	%
Expected dividend yield		0.00	%		0.00	%
Expected life (in years)		6.0			6.0
Estimated fair value per option granted	$	1.70		$	0.87

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

	Number of Options
Outstanding at January 1, 2014		5,994,788
Granted		866,250
Exercised		(665,597	)
Forfeited and cancelled		(73,438	)
Outstanding at September 30, 2014		6,122,003

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

	Shares
Non-vested at January 1, 2014		-
Granted		139,839
Forfeited and cancelled		(27,956	)
Vested		(14,036	)
Non-vested at September 30, 2014		97,847

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

	Three Months				Nine Months
	Ended September 30,				Ended September 30,
	2014		2013		2014		2013
Cost of sales	$	31	$	2	$	80	$	30
Research and development		128		35		331		189
Selling, general and administrative		221		220		571		2,422
	$	380	$	257	$	982	$	2,641