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Note 15 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Apr. 20, 2020
Mar. 09, 2020
Sep. 30, 2020
Sep. 30, 2019
Dividends Payable, Date Declared   Mar. 09, 2020    
Common Stock, Dividends, Per Share, Declared (in dollars per share)   $ 0.09    
Dividends Payable, Date to be Paid   Jun. 18, 2020    
Dividends Payable, Date of Record Apr. 20, 2020      
Dividends, Common Stock, Cash $ 4,852      
Payments of Dividends, Total     $ 4,836  
Dividends Payable     $ 16 $ 0