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Note 9 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Net operating loss carryforwards | $ 33,322 | $ 28,017
Share-based compensation | 2,561 | 2,706
Research and development credit carryforwards | 12,557 | 9,681
Capitalized research and development expenses | 27,538 | 12,690
Other | 1,371 | 934
Total deferred tax assets | 77,349 | 54,028
Valuation allowance | (77,349) | (54,002)
Net deferred tax assets | 0 | 26
Operating lease right-of-use assets | 0 | (26)
Total deferred tax liabilities | 0 | (26)
Net deferred tax asset (liability) | $ 0 | $ 0

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