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Note 7 - Stockholders' Equity and Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Total stock-based compensation expense | $ 16,291 | $ 4,586 | $ 2,066
Research and Development Expense [Member] |  |  |
Total stock-based compensation expense | 6,492 | 2,050 | 1,631
General and Administrative Expense [Member] |  |  |
Total stock-based compensation expense | $ 9,799 | $ 2,536 | $ 435

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