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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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