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