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Note 12 - Subsequent Events (Details Textual) - $ / shares
3 Months Ended 6 Months Ended
Oct. 19, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Common Stock, Dividends, Per Share, Declared (in dollars per share)   $ 1.00 $ 1.00 $ 2.00 $ 2.00
Subsequent Event [Member]          
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 1.00        
Dividends Payable, Date to be Paid Nov. 30, 2022        
Dividends Payable, Date of Record Oct. 31, 2022