Note 8 - Share-based Compensation - Share-based Compensation Expense 2 (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Total share-based compensation | $ 109 | $ 98 | $ 222 | $ 268 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||||
| Total share-based compensation | 63 | 55 | 118 | 150 |
| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense | ||||
| Total share-based compensation | $ 46 | $ 43 | $ 104 | $ 118 |