Note 6 - Equity Incentive Plan (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

	Six Months Ended June 30,
	2016			2015
Risk free interest rate	0.94%	-	1.40%	1.15%	-	1.46%
Expected volatility	49.47%	-	51.61%	53.15%	-	54.65%
Expected life (years)		4.5			4.5
Expected dividend yield		0.00%			0.00%