Note 14 - Warrants (Tables)

9 Months Ended

Sep. 30, 2013

Warrants [Abstract]

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

Risk-free interest rate:		3.24	%
Expected term: (years)		6.0
Expected dividend yield:	—
Expected volatility:		105.7	%

Risk-free interest rate:		1.96	%
Expected term: (years)		10.0
Expected dividend yield:	—
Expected volatility:		90.4	%

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Warrants	Number of Warrants			Weighted- Average Exercise Price
Outstanding at December 31, 2012		4,200,000		$	2.98
Granted		255,102		$	1.96
Exercised		(1,002,147	)	$	2.75
Forfeited or expired		(400,002	)	$	2.75
Outstanding at September 30, 2013		3,052,953		$	3.00
Exercisable at September 30, 2013		3,052,953		$	3.00