Note 14 - Stock-based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Share-Based Payment Arrangement, Expense | $ 44 | $ (13) | $ 435 | $ 1,003 |
| Research and Development Expense [Member] | ||||
| Share-Based Payment Arrangement, Expense | 30 | (81) | 184 | 317 |
| General and Administrative Expense [Member] | ||||
| Share-Based Payment Arrangement, Expense | $ 14 | $ 68 | $ 251 | $ 686 |
| 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
|