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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 | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Total stock-based compensation expense | $ 590 | $ 792 | $ 1,236 | $ 2,402
Cost of Sales [Member] |  |  |  |
Total stock-based compensation expense | 21 | 42 | 45 | 132
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 117 | 168 | 219 | 289
Selling, General and Administrative Expenses [Member] |  |  |  |
Total stock-based compensation expense | $ 452 | $ 582 | $ 971 | $ 1,981

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