Note 7 - Employee Benefit Plans - Allocation of Recognized Period Costs 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 | $ 5,998 | $ 6,199 | $ 12,394 | $ 12,795 |
| Location, Statement of Income, Balance [Axis]: us-gaap:CostOfRevenue | ||||
| Total stock-based compensation expense | 1,258 | 1,257 | 2,537 | 2,599 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||||
| Total stock-based compensation expense | 2,169 | 2,251 | 4,561 | 4,670 |
| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense | ||||
| Total stock-based compensation expense | $ 2,571 | $ 2,691 | $ 5,296 | $ 5,526 |