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Note 18 - Subsequent Events (Details Textual) - $ / shares
3 Months Ended 9 Months Ended
Oct. 17, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Common Stock, Dividends, Per Share, Declared   $ 0.075 $ 0.05 $ 0.225 $ 0.15
Subsequent Event [Member]          
Common Stock, Dividends, Per Share, Declared $ 0.075        
Dividends Payable, Date of Record Oct. 31, 2019        
Dividends Payable, Date to be Paid Nov. 15, 2019