Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Summary of Stock Options - Valuation Assumptions for Stock Options (Details)

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Note 9 - Summary of Stock Options - Valuation Assumptions for Stock Options (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Expected term (in years) (Year) 5 years 5 years 5 years 5 years
Average volatility 64.00% 46.00% 55.00% 54.00%
Risk-free interest rate 1.73% 1.14% 1.83% 1.31%
Dividend yield 0.00% 0.00% 0.00% 0.00%