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Note 9 - Earnings Per Share (Details Textual) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 207,930 124,730
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 387,930 284,730
Employee Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 22,930 0