Note 4 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item 2 (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Total stock-based compensation expense | $ 5,264 | $ 4,526 |
| Location, Statement of Income, Balance [Axis]: us-gaap:CostOfRevenue | ||
| Total stock-based compensation expense | 343 | 340 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||
| Total stock-based compensation expense | 605 | 687 |
| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense | ||
| Total stock-based compensation expense | $ 4,316 | $ 3,499 |