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Note 6 - Stockholders' Equity and Stock-based Compensation Expense (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Share-Based Payment Arrangement, Activity [Table Text Block] |
|  | Stock Options |  |  | Performance Awards |
Outstanding as of December 31, 2024 |  |  | 4,463,028 |  |  |  | 7,142 |
Options granted |  |  | — |  |  |  | — |
Options exercised |  |  | (225,209 | ) |  |  | — |
Options forfeited/canceled |  |  | (959,051 | ) |  |  | — |
Outstanding as of March 31, 2025 |  |  | 3,278,768 |  |  |  | 7,142 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three months ended |
|  | March 31, |
|  | 2025 |  |  | 2024 |
Research and development |  | $ | 2,372 |  |  | $ | 973 |
General and administrative |  |  | 2,853 |  |  |  | 1,362 |
Total stock-based compensation expense |  | $ | 5,225 |  |  | $ | 2,335 |

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