Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Summary of Stock Options - Valuation Assumptions for Stock Options (Details)

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Note 12 - Summary of Stock Options - Valuation Assumptions for Stock Options (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Expected term (Year) 5 years 5 years 5 years
Average volatility 75.00% 73.00% 73.00%
Risk-free interest rate 2.03% 0.45% 2.49%
Dividend yield 0.00% 0.00% 0.00%