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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Total stock-based compensation expense | $ 397 | $ 825 | $ 646 | $ 1,610
Cost of Sales [Member] |  |  |  |
Total stock-based compensation expense | 21 | 50 | 24 | 90
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 92 | 70 | 103 | 121
Selling, General and Administrative Expenses [Member] |  |  |  |
Total stock-based compensation expense | $ 283 | $ 705 | $ 519 | $ 1,399

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