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Note 12 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 17, 2017
Mar. 31, 2017
Mar. 31, 2016
Common Stock, Dividends, Per Share, Declared   $ 0.25 $ 0.20
Subsequent Event [Member]      
Common Stock, Dividends, Per Share, Declared $ 0.27    
Dividends Payable, Current $ 6.7