Note 9 - Long Term Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2013

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

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

	2013			2012
Expected volatility		76.87	%		71.46	%
Risk-free interest rate		1.78	%		0.58	%
Expected dividend yield		0.00	%		0.00	%
Expected life (in years)		6.00			6.00
Estimated fair value per option granted	$	1.08		$	0.67

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

						Weighted
				Weighted		average
	Number			average		remaining		Aggregate
	of			exercise		contractual		intrinsic
	options			price		life (years)		value
Outstanding at January 1, 2013		4,294,273		$	2.08
Granted		1,989,000			1.61
Exercised		(73,230	)		0.72
Forfeited and cancelled		(215,255	)		1.57
Outstanding at December 31, 2013		5,994,788			1.96		7.0	$	2,904,515
Exercisable at December 31, 2013		4,056,572			2.13		5.6	$	1,929,051

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

				Weighted average
	Shares			grant date fair value
Nonvested at January 1, 2013		343,161		$	1.76
Granted		329,164			0.81
Vested		(672,325	)		1.30
Nonvested at December 31, 2013		-			0.00

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

	2013		2012
Cost of sales	$	35	$	75
Research and development		243		323
Selling, general and administrative		2,715		540
	$	2,993	$	938