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Note 12 - Earnings Per Share (Details Textual) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Stock Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 147,400 15,800 161,400
Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     1,000