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Note 12 - Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2025
Notes Tables |
Common Stock Reserved for Future Issuance [Table Text Block] |
|  | December 31, 2025 |
Employee and non-employee stock options |  |  | 6,864,854 |
Common shares issuable upon settlement of deferred stock units |  |  | 174,515 |
Shares available for grant under the Amended and Restated 2019 Omnibus Incentive Plan |  |  | 948,666 |
Shares available for grant under the 2021 Employment Inducement Incentive Plan |  |  | 653,125 |
Total |  |  | 8,641,160 |

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