Note 11 - Stock and Employee Benefit Plans - Schedule of Employee Service Share-based Compensation Costs (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Share-based payment arrangement expense | $ 4,402 | $ 5,215 |
| Research and Development Expense [Member] | ||
| Share-based payment arrangement expense | 1,905 | 2,274 |
| General and Administrative Expense [Member] | ||
| Share-based payment arrangement expense | $ 2,497 | $ 2,941 |
| 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
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