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Note 3 - Earnings Per Share (Details) - $ / shares | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Note 3 - Earnings Per Share (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 41,787 | 55,939 | 41,787 | 55,939 | 46,451 | 58,581
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 | $ 40.24 |  | $ 40.24 | $ 40.24 |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 8,585 | 7,888 | 9,254 | 6,688 |  |
Employee Stock Option [Member] |  |  |  |  |  |
Note 3 - Earnings Per Share (Details) [Line Items] |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements |  | 27,375 |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |
Note 3 - Earnings Per Share (Details) [Line Items] |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 26,350 |  | 26,350 | 28,282 |  |

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