Note 5 - 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 |
|
| Share-Based Payment Arrangement, Expense | $ 436 | $ 417 | $ 816 | $ 902 |
| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense | ||||
| Share-Based Payment Arrangement, Expense | 256 | 300 | 503 | 665 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||||
| Share-Based Payment Arrangement, Expense | $ 180 | $ 117 | $ 313 | $ 237 |