Note 3 - Fair Value of Financial Instruments (Tables)

3 Months Ended

6 Months Ended

Mar. 31, 2013

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Three months ended June 30, 2013					Six months ended June 30, 2013
	Accrued Warrant Liability			Compensatory Stock Options Not Yet Issued		Accrued Warrant Liability		Compensatory Stock Options Not Yet Issued
Beginning balance	$	7,553,382		$	63,641	$	4,105,659	$	-
Total (gains) or losses, realized and unrealized, included in earnings (1)		(2,795,612	)		-		652,111		-
Estimates and other changes in fair value (2)		-			197		-		63,838
Settlements		-			-		-		-
Balance, June 30, 2013	$	4,757,770		$	63,838	$	4,757,770	$	63,838

	Three months ended June 30, 2012					Six months ended June 30, 2012
	Accrued Warrant Liability			Compensatory Stock Options Not Yet Issued		Accrued Warrant Liability			Compensatory Stock Options Not Yet Issued
Beginning balance	$	5,566,203		$	85,000	$	7,285,959		$	378,750
Total (gains) or losses, realized and unrealized, included in earnings (1)		(2,543,270	)		-		(4,263,026	)		51,823
Estimates and other changes in fair value (2)		-			29,617		-			114,617
Settlements		-			-		-			(430,573	)
Balance, June 30, 2012	$	3,022,933		$	114,617	$	3,022,933		$	114,617

	As of June 30, 2013
	Level 1		Level 2		Level 3		Total
Liabilities:
Compensatory stock options not yet issued (1)	$	-	$	-	$	63,838	$	63,838
Accrued warrant liability		-		-		4,757,770		4,757,770
Total liabilities	$	-	$	-	$	4,821,608	$	4,821,608

	As of December 31, 2012
	Level 1		Level 2		Level 3		Total
Liabilities:
Accrued warrant liability	$	-	$	-	$	4,105,659	$	4,105,659
Total liabilities	$	-	$	-	$	4,105,659	$	4,105,659

Schedule of Share-based Payment Award, Warrant Liability, Valuation Assumptions [Table Text Block]

	June 30, 2013			December 31, 2012
Stock Price	$1.58			$1.33
Exercise Price	$1.60	-	5.00	$1.60	-	5.00
Term in years	0.84	-	2.16	1.09	-	2.41
Volatility	68.47	-	87.18%	82.75	-	95.91%
Annual rate of quarterly dividends	0%			0%
Discount rate- bond equivalent yield	.13	-	.40%	.17	-	.29%

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

	June 30, 2013
Stock price	$	1.58
Term in years		5
Volatility		80.80	%
Annual rate of quarterly dividends		0	%
Discount rate - bond equivalent yield		1.41	%

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]

	June 30, 2013
Description	Fair Value		Valuation Technique	Unobservable Input	Estimate/ Range
Compensatory stock options not yet issued	$	63,838	Black-scholes pricing model	Expected term	5
				Quantity of options	62,500
Accrued warrant liability		4,757,770	Black-scholes pricing model	Expected term	0.84	-	2.16
	$	4,821,608