Note 10 - Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

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

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

	Six Months Ended June 30,
	2013					2012
Risk-free interest rate		0.85	-	1.19	%		1.60	-	2.97	%
Expected volatility		83.41	-	97.83	%		80.8	-	82.3	%
Expected life (in years)		5.25	-	6.0			5.00	-	6.30
Expected forfeiture rate		5.0	-	7.5	%		0.0	-	7.5	%
Expected dividend yield			0.0%					0.0%

Schedule of Shar-based Compensation, Stock Options and Restricted Stock Awards, Activity [Table Text Block]

	Stock Options					Restricted Stock Awards					Weighted
Equity Awards	Options Outstanding			Weighted Average Exercise Price		Non-vested Restricted Stock Outstanding			Weighted Average Grant Date Fair Value		Average Contractual Terms of Equity Awards (in years)
Equity awards outstanding at December 31, 2012		3,264,880		$	3.25		19,334		$	3.20
Equity awards granted		845,000		$	0.98		-		$	-
Equity awards exercised		(55,932	)	$	3.49		(1,500	)	$	2.09
Equity awards forfeited, cancelled or expired		(36,667	)	$	6.45		(4,167	)	$	4.13
Equity awards outstanding at June 30, 2013		4,017,281		$	2.74		13,667		$	3.03		7.1
Aggregate intrinsic value of outstanding awards June 30, 2013	$	25,600				$	13,940
Equity awards exercisable at June 30, 2013		2,662,879		$	2.26							6.1
Aggregate intrinsic value of awards exercisable at June 30, 2013	$	8,440