Note 10 - Stock Based Compensation (Tables)

9 Months Ended

Sep. 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]

	Nine Months Ended September 30,
	2013					2012
Risk-free interest rate		0.85	-	1.19	%		1.60	-	2.97	%
Expected volatility		83.41	-	97.83	%		80.2	-	82.3	%
Expected life (in years)		5.25	-	6.0			5.00	-	6.25
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		725,529		$	14.63		4,296		$	14.40
Equity awards granted		187,777		$	4.41		111		$	5.36
Equity awards exercised		(12,429	)	$	15.71		(444	)	$	8.42
Equity awards forfeited, cancelled or expired		(35,268	)	$	17.10		(926	)	$	18.59
Equity awards outstanding at September 30, 2013		865,609		$	12.29		3,037		$	13.64		6.6
Aggregate intrinsic value of outstanding awards September 30, 2013	$	136,533				$	15,717
Equity awards exercisable at September 30, 2013		599,000		$	14.31							5.7
Aggregate intrinsic value of awards exercisable at September 30, 2013	$	45,009