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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Expected term (Year) 5 years 5 years 5 years 5 years
Average volatility 69.00% 48.00% 75.00% 48.00%
Risk-free interest rate 2.82% 1.76% 2.63% 1.90%
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 91.00% 55.00% 91.00% 55.00%
Risk-free interest rate 2.85% 2.00% 2.85% 2.29%
Dividend yield 0.00% 0.00% 0.00% 0.00%