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Note 3 - Dividends (Details Textual) - $ / shares
3 Months Ended
Feb. 12, 2020
Mar. 31, 2020
Mar. 31, 2019
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.25 $ 0.25 $ 0.24
Dividends Payable, Date to be Paid May 15, 2020    
Dividends Payable, Date of Record May 01, 2020