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Note 10 - Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2026
Notes Tables |
Common Stock Reserved for Future Issuance [Table Text Block] |
|  | June 30, 2026 |
Issuable upon exercise of employee and non-employee stock options |  |  | 8,180,495 |
Issuable upon settlement of deferred stock units |  |  | 190,785 |
Issuable upon vesting and settlement of restricted stock units |  |  | 1,677 |
Available for grant under the Amended and Restated 2019 Omnibus Incentive Plan |  |  | 2,989,251 |
Available for grant under the 2021 Employment Inducement Incentive Plan |  |  | 528,125 |
Total |  |  | 11,890,333 |

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