Note 6 - Redeemable Convertible Preferred Stock (Tables)

9 Months Ended

Sep. 30, 2014

Redeemable Convertible Preferred Stock [Abstract]

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

Expected term (in years)	1.84	-	3.50
Expected volatility	63.0%	-	86.0%
Risk-free interest rate	0.44%	-	1.12%
Expected dividend yield		0%

Expected term (in years)	1.34	-	3.00
Expected volatility	63.0%	-	71.0%
Risk-free interest rate	0.34%	-	1.05%
Expected dividend yield		0%