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Note 7 - Stockholders' Equity and Stock-based Compensation Expense - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Total stock-based compensation expense | $ 2,604 | $ 835 | $ 4,939 | $ 1,508
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 972 | 392 | 1,945 | 781
General and Administrative Expense [Member] |  |  |  |
Total stock-based compensation expense | $ 1,632 | $ 443 | $ 2,994 | $ 727

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