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Note 9 - Earnings Per Share (Details Textual) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 108,053 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 259,730  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 159,730