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Note 7 - Leases (Details Textual) - USD ($)
Mar. 31, 2020
Apr. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
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