Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Stock-based Compensation - Weighted Average Assumptions (Details)

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Note 11 - Stock-based Compensation - Weighted Average Assumptions (Details) - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Risk-free interest rate 0.52% 1.27%
Expected dividend yield 0.00% 0.00%
Expected volatility 81.80% 85.90%
Expected life of options (Year) 5 years 5 years
Grant date fair value (in dollars per share) $ 2.59 $ 4.59