Note 12 - Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

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,
	2014			2013
Risk-free interest rate		2.63 - 2.75	%		0.85-1.19	%
Expected volatility		98.7 – 100.7	%		83.4 – 97.8	%
Expected life (in years)		10.00			5.25 – 6.0
Expected forfeiture rate		5	%		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
Equity Awards	Options Outstanding			Weighted Average Exercise Price		Non-vested Restricted Stock Outstanding			Weighted Average Grant Date Fair Value		Weighted Average Contractual Terms of Equity Awards (in years)
Equity awards outstanding at December 31, 2013		861,905		$	12.30		2,112		$	16.29
Equity awards granted		1,045,433		$	3.55		19,250		$	3.55
Equity awards exercised	–			–			(6,091	)	$	8.00
Equity awards forfeited, cancelled or expired		(44,009	)	$	22.31	–			–
Equity awards outstanding at June 30, 2014		1,863,329		$	7.15		15,271		$	3.54		8.02
Aggregate intrinsic value of outstanding awards at June 30, 2014	$	–				$	54,039
Equity awards exercisable at June 30, 2014		1,033,290		$	10.26							6.72
Aggregate intrinsic value of awards exercisable at June 30, 2014	$	–