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Note 9 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Net operating loss carryforwards | $ 43,148 | $ 33,322
Share-based compensation | 4,814 | 2,561
Research and development credit carryforwards | 13,789 | 12,557
Capitalized research and development expenses | 33,598 | 27,538
Other | 1,340 | 1,371
Total deferred tax assets | 96,689 | 77,349
Valuation allowance | (96,689) | (77,349)
Net deferred tax assets | 0 | 0
Operating lease right-of-use assets | 0 | 0
Total deferred tax liabilities | 0 | 0
Net deferred tax asset (liability) | $ 0 | $ 0

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