Note 5 - Stockholders' Equity (Deficit), Equity Incentive Plans, And Stock-Based Compensation - Summary of Common Stock Reserved for Future Issuance (Details) |
Mar. 31, 2026
shares
|
|---|---|
| Shares underlying outstanding warrants (in shares) | 19,075,842 |
| Shares reserved for future grants under the 2020 Equity Incentive Plan (in shares) | 20,158,983 |
| Shares underlying outstanding stock options (in shares) | 569,098 |
| Equity Incentive Plan 2020 [Member] | |
| Shares reserved for future grants under the 2020 Equity Incentive Plan (in shares) | 514,043 |