Note 10. Warrants (Tables)

9 Months Ended

Sep. 30, 2012

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, 2011		11,627,001		$	3.15
Warrants granted in connection with the Credit Agreement as more fully described in Note 9		51,370		$	2.92
Warrants exercised for common stock		(1,512,110	)		2.58
Warrants outstanding at September 30, 2012		10,166,261		$	3.23
Aggregate intrinsic value of outstanding warrants at September 30, 2012	$	22,232,473
Weighted average remaining contractual terms (years)	4.20

	September 30, 2012			December 31,2011
Risk-free interest rate		0.62	%		0.83	%
Expected volatility		55.14	%		75.17	%
Expected life (in years)		1.25			1.6
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, January 1, 2012	$	166,398
Issuances		-
Loss from the adjustment for the change in fair value included in net loss		1,250,850
Ending balance, September 30, 2012	$	1,417,248