Note 4 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item 2 (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Total stock-based compensation expense | $ 6,517 | $ 3,766 | $ 11,781 | $ 8,292 |
| Location, Statement of Income, Balance [Axis]: us-gaap:CostOfRevenue | ||||
| Total stock-based compensation expense | 533 | 266 | 875 | 605 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||||
| Total stock-based compensation expense | 829 | 511 | 1,433 | 1,199 |
| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense | ||||
| Total stock-based compensation expense | $ 5,155 | $ 2,989 | $ 9,473 | $ 6,488 |