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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
Jun. 30, 2025
Jun. 30, 2024
Total stock-based compensation expense $ 4,526 $ 1,229
Cost of Sales [Member]    
Total stock-based compensation expense 340 58
Research and Development Expense [Member]    
Total stock-based compensation expense 687 143
Selling, General and Administrative Expenses [Member]    
Total stock-based compensation expense $ 3,499 $ 1,028