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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 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Total stock-based compensation expense $ 3,822 $ 2,861 $ 12,114 $ 4,933
Cost of Sales [Member]        
Total stock-based compensation expense 269 211 875 309
Research and Development Expense [Member]        
Total stock-based compensation expense 504 442 1,703 697
Selling, General and Administrative Expenses [Member]        
Total stock-based compensation expense $ 3,049 $ 2,208 $ 9,536 $ 3,927