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Note 12 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 03, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Dividends, Common Stock, Total   $ 6,731 $ 6,727 $ 6,448 $ 6,718
Common Stock, Dividends, Per Share, Declared (in dollars per share)       $ 0.12  
Subsequent Event [Member]          
Dividends, Common Stock, Total $ 6,700        
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.12        
Dividends Payable, Date of Record Aug. 17, 2022        
Dividends Payable, Date to be Paid Aug. 31, 2022