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Note 7 - Stockholders' Equity and Stock-based Compensation Expense (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Share-Based Payment Arrangement, Activity [Table Text Block] |
|  | Stock Options |  |  | Performance Awards |
Outstanding as of December 31, 2023 |  |  | 3,039,029 |  |  |  | 7,142 |
Options granted |  |  | 1,273,000 |  |  |  | — |
Options exercised |  |  | — |  |  |  | — |
Options forfeited/canceled |  |  | (208,000 | ) |  |  | — |
Outstanding as of September 30, 2024 |  |  | 4,104,029 |  |  |  | 7,142 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three months ended |  |  | Nine months ended |
|  | September 30, |  |  | September 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Research and development |  | $ | 1,675 |  |  | $ | 405 |  |  | $ | 3,620 |  |  | $ | 1,186 |
General and administrative |  |  | 3,934 |  |  |  | 544 |  |  |  | 6,927 |  |  |  | 1,271 |
Total stock-based compensation expense |  | $ | 5,609 |  |  | $ | 949 |  |  | $ | 10,547 |  |  | $ | 2,457 |

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