Note 10 - Stock-based Compensation (Details Textual) - The 2020 Equity Incentive Plan [Member] |
Sep. 30, 2020
shares
|
|---|---|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 5,885,526 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 12,914,185 |
| Restricted Stock Units (RSUs) [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) | 1,425,327 |