Note 8 - 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 |
|
| Stock-based compensation expense | $ 4,822 | $ 2,791 | $ 9,895 | $ 5,305 |
| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense | ||||
| Stock-based compensation expense | 2,721 | 1,934 | 5,722 | 3,641 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost | ||||
| Stock-based compensation expense | $ 2,101 | $ 857 | $ 4,173 | $ 1,664 |