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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Expected term (Year) 5 years 5 years 5 years 5 years
Average volatility 70.00% 64.00% 73.00% 55.00%
Risk-free interest rate 2.86% 1.73% 2.67% 1.83%
Dividend yield 0.00% 0.00% 0.00% 0.00%
Nonemployees [Member]        
Expected term (Year) 10 years 10 years 10 years 10 years
Average volatility 66.00% 78.00% 66.00% 78.00%
Risk-free interest rate 3.04% 2.32% 3.04% 2.31%
Dividend yield 0.00% 0.00% 0.00% 0.00%