Note 12 - Stock-based Compensation - Share-based Payment Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Share-based Payment Arrangement, Expense | $ 809 | $ 1,874 |
| Research and Development Expense [Member] | ||
| Share-based Payment Arrangement, Expense | 328 | 652 |
| General and Administrative Expense [Member] | ||
| Share-based Payment Arrangement, Expense | $ 481 | $ 1,222 |
| 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
|