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Note 2 - Dividends (Details Textual) - $ / shares
3 Months Ended
Apr. 14, 2021
Mar. 31, 2021
Mar. 31, 2020
Common Stock, Dividends, Per Share, Declared (in dollars per share)   $ 0.25 $ 0.25
Subsequent Event [Member]      
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.26    
Dividends Payable, Date to be Paid May 14, 2021    
Dividends Payable, Date of Record Apr. 30, 2021