Note 11 - Stock-based Compensation - Share-based Payment Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2023 |
|
| Share-based Payment Arrangement, Expense | $ 207 | $ 769 | $ 1,016 | $ 2,643 |
| Research and Development Expense [Member] | ||||
| Share-based Payment Arrangement, Expense | 70 | 271 | 398 | 923 |
| General and Administrative Expense [Member] | ||||
| Share-based Payment Arrangement, Expense | $ 137 | $ 498 | $ 618 | $ 1,720 |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|