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Note 3 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Total stock-based compensation expense | $ 1,229 | $ 1,357
Cost of Sales [Member] |  |
Total stock-based compensation expense | 58 | 109
Research and Development Expense [Member] |  |
Total stock-based compensation expense | 143 | 156
Selling, General and Administrative Expenses [Member] |  |
Total stock-based compensation expense | $ 1,028 | $ 1,092

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