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Note 9 - Income Taxes - Schedule of Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
U.S. federal statutory tax rate | $ (19,104) |  |
U.S. federal statutory tax rate, percent | 21.00% | 21.00% | 21.00%
Stock compensation | $ 3,580 |  |
Stock compensation, percent | (4.00%) | (5.70%) | 0.20%
Section 162(m) limitation | $ 0 |  |
Section 162(m) limitation, percent | 0.00% | (0.20%) | 0.00%
Change in fair value of warrant liabilities | $ 0 |  |
Change in fair value of warrant liabilities, percent | 0.00% | 93.30% | 0.00%
SEC settlement payment | $ 0 |  |
SEC settlement payment, percent | 0.00% | (34.50%) | 0.00%
Change in valuation allowance | $ 15,207 |  |
Change in valuation allowance, percent | (16.70%) | (79.40%) | (24.00%)
Research and development credits | $ (1,021) |  |
Research and development credits, percent | 1.10% | 15.40% | 5.10%
Tax attribute expiration | $ 922 |  |
Tax attribute expiration, percent | (1.00%) | (4.10%) | 0.00%
Uncertain tax positions | $ 409 |  |
Uncertain tax positions, percent | (0.40%) | (6.10%) | (2.00%)
State tax, net of federal benefit | $ 0 |  |
State tax, net of federal benefit, percent | 0.00% | 0.00% | 0.00%
Other | $ 7 |  |
Other, percent | 0.00% | 0.30% | (0.30%)
Effective income tax rate | $ 0 |  |
Effective income tax rate, percent | 0.00% | 0.00% | 0.00%

X
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