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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019
Income Tax Expense (Benefit), Total | $ 112 | $ 1,584 | $ 29 | $ 4,548 |
Liability for Uncertainty in Income Taxes, Current | $ 0 |  | 0 |  |
Unrecognized Tax Benefits, Ending Balance |  |  |  |  | $ 0
Maximum [Member] |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  | $ 100 |  |

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