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Note 2 - Earnings Per Share (Details Textual) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 29,324 31,949 46,451
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 17.55 $ 17.55 $ 17.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 37.48 $ 40.24 $ 40.24
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 11,357 9,154 7,871
Employee Stock Option [Member]      
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 29,324 27,250 28,282