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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Expected term (Year) 5 years 5 years 6 years 5 years
Average volatility 84.00% 87.00% 76.00% 81.00%
Risk-free interest rate 0.81% 0.27% 0.97% 0.34%
Dividend yield 0.00% 0.00% 0.00% 0.00%