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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 | 6 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Total stock-based compensation expense | $ 849 | $ 397 | $ 1,758 | $ 646
Cost of Sales [Member] |  |  |  |
Total stock-based compensation expense | 30 | 21 | 59 | 24
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 161 | 92 | 291 | 103
Selling, General and Administrative Expenses [Member] |  |  |  |
Total stock-based compensation expense | $ 658 | $ 283 | $ 1,408 | $ 519

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