Note 11 - Warrants (Tables)

3 Months Ended

Mar. 31, 2013

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 March 31, 2013		13,828,622		$	2.42
Aggregate intrinsic value of outstanding warrants at March 31, 2013	$	–
Weighted average remaining contractual terms (years)		4.23

	March 31, 2013			December 31, 2012
Risk-free interest rate		0.77	%		0.73	%
Expected volatility		65.8	%		92.0	%
Expected life (in years)		1.00			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
Issuances		-
Gain from the adjustment for the change in fair value included in net income		(4,280,297	)
Ending balance as of March 31, 2013	$	3,635