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Note 10 - Earnings Per Share (Details Textual) - shares
6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 173,730 259,730
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 148,730 147,230