Note 10 - Stock-based Compensation - Stock-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 stock-based compensation expense | $ 917 | $ 162 | $ 1,099 | $ 1,092 |
| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense | ||||
| Total stock-based compensation expense | 874 | 148 | 1,029 | 944 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||||
| Total stock-based compensation expense | 35 | 13 | 57 | 102 |
| Location, Statement of Income, Balance [Axis]: us-gaap:SellingAndMarketingExpense | ||||
| Total stock-based compensation expense | $ 8 | $ 1 | $ 13 | $ 46 |