Note 2 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

Notes Tables

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

Risk-free interest rate		1.45	%
Expected volatility		102	%
Dividend yield		0	%
Expected option term (years)	5

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Options		Weighted average e xercise price		Weighted average remaining contractual term (in years)		Aggregate intrinsic value
Outstanding at beginning of period	349,983		$	10.97
Exercised	(55,000	)		8.00
Outstanding and vested at end of period	294,983		$	11.53		2.07	$	248,597