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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, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Total stock-based compensation expense | $ 839 | $ 590 | $ 2,597 | $ 1,236
Cost of Sales [Member] |  |  |  |
Total stock-based compensation expense | (23) | 21 | 35 | 45
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 179 | 117 | 470 | 219
Selling, General and Administrative Expenses [Member] |  |  |  |
Total stock-based compensation expense | $ 683 | $ 452 | $ 2,092 | $ 971

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