Note 3 - Fair Value Measurements (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2014

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Assets and Liabilities at Fair Value as of September 30, 2014
	Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
	Level 1		Level 2		Level 3		Total
Assets
Money market fund	$	190	$	-	$	-	$	190
Total assets	$	190	$	-	$	-	$	190
Liabilities
Preferred stock warrant liabilities	$	-	$	-	$	-	$	-
Total liabilities	$	-	$	-	$	-	$	-

	Assets and Liabilities at Fair Value as of December 31, 2013
	Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
	Level 1		Level 2		Level 3		Total
Assets
Money market fund	$	324	$	-	$	-	$	324
Total assets	$	324	$	-	$	-	$	324
Liabilities
Preferred stock warrant liabilities	$	-	$	-	$	623,672	$	623,672
Total liabilities	$	-	$	-	$	623,672	$	623,672

	Assets and Liabilities at Fair Value as of December 31, 2012
	Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
	Level 1		Level 2		Level 3		Total
Assets
Money market fund	$	503	$	-	$	-	$	503
Total assets	$	503	$	-	$	-	$	503
Liabilities
Preferred stock warrant liabilities	$	-	$	-	$	685,213	$	685,213
Total liabilities	$	-	$	-	$	685,213	$	685,213

	Assets and Liabilities at Fair Value as of December 31, 2013
	Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
	Level 1		Level 2		Level 3		Total
Assets
Money market fund	$	324	$	-	$	-	$	324
Total assets	$	324	$	-	$	-	$	324
Liabilities
Preferred stock warrant liabilities	$	-	$	-	$	623,672	$	623,672
Total liabilities	$	-	$	-	$	623,672	$	623,672

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

Fair value as of December 31, 2013	$	623,672
Change in fair value recorded in other income (expense), net		(21,484	)
Fair value as of March 31, 2014		602,188
Change in fair value recorded in other income (expense), net		(22,001	)
Fair value as of June 30, 2014		580,187
Change in fair value recorded in other income (expense), net, as of September 23, 2014, date of the Merger Agreement		(7,277	)
Extinguishment of warrant liabilities pursuant to the Merger Agreement (reclassified to equity)		(572,910	)
Fair value as of September 30, 2014	$	-

Fair value as of December 31, 2011	$	646,844
Fair value of warrants issued		194,532
Change in fair value recorded in other income (expense), net		(156,163	)
Fair value as of December 31, 2012		685,213
Fair value of warrants issued		-
Change in fair value recorded in other income (expense), net		(61,541	)
Fair value as of December 31, 2013	$	623,672

Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block]

	Fair Value as of		Valuation	Unobservable	Range
	December 31, 2013		Techniques	Input	(Weighted-Average)
Preferred stock warrant liabilities	$	623,672	Black-Scholes	Preferred series
			option pricing	prices	$0.04	-	$0.44	(-	$0.06	-)
			model
				Volatility	70.62%	-	84.23%	(-	76%	-)

	Fair Value as of				Range
	December 31, 2012		Valuation	Unobservable	(Weighted-Average)
Preferred stock	$	685,213	Black-Scholes	Preferred series
warrant liabilities			option pricing model	prices	$0.04	-	0.44	(-	$0.06	-)
				Volatility	74.2%	-	91.6%	(-	83%	-)

	Fair Value as of				Range
	December 31, 2013		Valuation	Unobservable	(Weighted-Average)
Preferred stock	$	623,672	Black-Scholes	Preferred series
warrant liabilities			option pricing model	prices	$0.04	-	0.44	(-	$0.06	-)
				Volatility	70.6%	-	84.2%	(-	76%	-)