Note 8 - Stock-based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Stock-based compensation | $ 1,944 | $ 1,609 | $ 3,990 | $ 3,219 |
| Share-Based Payment Arrangement, Option [Member] | ||||
| Stock-based compensation | 910 | 732 | 1,810 | 1,473 |
| Restricted Stock Units (RSUs) [Member] | ||||
| Stock-based compensation | 634 | 573 | 1,320 | 1,134 |
| Performance-based Restricted Units [Member] | ||||
| Stock-based compensation | $ 400 | $ 304 | $ 860 | $ 612 |