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Note 12 - Subsequent Events (Details Textual) - $ / shares
3 Months Ended
Jul. 20, 2022
Jun. 30, 2022
Jun. 30, 2021
Common Stock, Dividends, Per Share, Declared (in dollars per share)   $ 1.00 $ 1.00
Subsequent Event [Member]      
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 1.00    
Dividends Payable, Date to be Paid Aug. 31, 2022    
Dividends Payable, Date of Record Aug. 01, 2022