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Note 7 - Leases (Details Textual) - USD ($) | Mar. 31, 2020 | Apr. 01, 2019 | Mar. 31, 2019 | Mar. 31, 2018
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Stockholders' Equity Attributable to Parent, Ending Balance | $ 394,364,000 |  | $ 417,485,000 |
Retained Earnings [Member] |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | $ 459,797,000 |  | $ 409,504,000 | $ 403,780,000
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance |  | $ 2,019,000 |  |

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