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Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Retained Earnings [Member] |  |  |
Dividends paid, per share (in dollars per share) | $ 0.64 | $ 0.64 | $ 0.64
Common Stock Including Additional Paid in Capital [Member] |  |  |
Proceeds from issuance of common stock, issuance costs | $ 5,568 |  |
Allocated costs and taxes | $ 8,338 |  |

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