Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Summary of Stock Options - Valuation Assumptions for Stock Options (Details)

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Note 8 - Summary of Stock Options - Valuation Assumptions for Stock Options (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Expected term (in years) (Year) 5 years 5 years 5 years 5 years
Average volatility 48.00% 47.00% 48.00% 65.00%
Risk-free interest rate 1.76% 1.26% 1.90% 1.53%
Dividend yield 0.00% 0.00% 0.00% 0.00%