Note 11 - Warrants (Tables)

6 Months Ended

Jun. 30, 2013

Warrants [Abstract]

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

Warrants	Number of Warrants Issued			Weighted Average Exercise Price
Warrants outstanding at December 31, 2012		7,863,653		$	3.37
Warrants granted in connection with the Preferred Stock Offering, as more fully described in Note 9		6,036,219		$	1.18
Warrants exercised for common stock		(71,250	)		3.25
Warrants outstanding at June 30, 2013		13,828,622		$	2.42
Aggregate intrinsic value of outstanding warrants at June 30, 2013	$	-
Weighted average remaining contractual terms (in years)		4.0

	June 30, 2013					December 31, 2012
Risk-free interest rate		0.36	-	1.41	%		0.73	%
Expected volatility		103.4	-	147.3	%		92.0	%
Expected life (in years)		0.9	-	4.7			1.13
Expected forfeiture rate			0.0		%		0.0	%
Expected dividend yield			0.00		%		0.00	%

Schedule of Common Stock Warranty Liability [Table Text Block]

Beginning balance as of January 1, 2013	$	4,283,932
Warrant liability classification (see Note 9)		9,110,302
Gain from the adjustment for the change in fair value included in net income		(8,660,417	)
Ending balance as of June 30, 2013	$	4,733,817