Note 10 - Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

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

	Three Months ended March 31,
	2013	2012
Risk-free interest rate	0.85%	2.97%
Expected volatility	83.41%	80.8-81.3%
Expected life (in years)	5.25	6.00 – 6.30
Expected forfeiture rate	5%	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		19,337	$	3.2
Equity awards granted		15,000		$	1.30		–	$	–
Equity awards exercised		(49,266	)	$	3.57		–	$	–
Equity awards forfeited, cancelled or expired		(3,333	)	$	6.45		–	$	–
Equity awards outstanding at March 31, 2013		3,227,281		$	3.25		19,337	$	3.2		6.6
Aggregate intrinsic value of outstanding awards March 31, 2013	$	–				$	61,813
Equity awards exercisable at March 31, 2013		2,306,490		$	3.52						5.7
Aggregate intrinsic value of awards exercisable at March 31, 2013	$	–