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Note 4 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Total stock-based compensation expense | $ 3,766 | $ 843 | $ 8,292 | $ 2,072
Cost of Sales [Member] |  |  |  |
Total stock-based compensation expense | 266 | 39 | 605 | 97
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 511 | 113 | 1,199 | 256
Selling, General and Administrative Expenses [Member] |  |  |  |
Total stock-based compensation expense | $ 2,989 | $ 691 | $ 6,488 | $ 1,719

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