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Note 7 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 23, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Common Stock, Dividends, Per Share, Declared   $ 0.18 $ 0.15 $ 0.54 $ 0.45
Subsequent Event [Member]          
Common Stock, Dividends, Per Share, Declared $ 0.18        
Dividends Payable $ 991        
Dividends Payable, Date to be Paid Nov. 12, 2018        
Dividends Payable, Date of Record Nov. 02, 2018