Note 3 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Disclosure Text Block [Abstract]

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

			Fair value measurement at reporting date using
Derivative liabilities on account of warrants	Balance		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
As of March 31, 2014	$	9,087		—		—	$	9,087
As of December 31, 2013		—		—		—		—

Notes and loans payable
As of March 31, 2014	$	5,178	—	$	5,178	—
As of December 31, 2013	$	4,905	—	$	4,905	—

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

	Level 3
Balance at Inception	$	—
Balance at December 31, 2013		—
Derivative warrants issued to investors in connection with the March 2014 Financing		7,404
Exercise of derivative warrants		—
Fair value adjustment at end of period, included in statement of operations		1,683
Balance at March 31, 2014		9,087

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

Description	Valuation technique	Unobservable inputs	As of March 10, 2014			As of March 31, 2014
Derivative March 2014 Warrants	Monte-Carlo model	Volatility		82.9%			83.3%
		Risk free interest rate	0.40%	–	0.60%	0.40%	–	0.60%
		Expected term, in years		2.50			2.42
		Dividend yield		0%			0%
		Probability and timing of down-round triggering event	63.5% for on August 1, 2014; 33.5% for on October 1, 2014; and 3% for every six months from September 10, 2014
		Stock Price		$3.04			$4.82