Note 13 - Stock Based Compensation (Details) - Stock Options Oustanding by Range of Exercise Prices (USD $)	6 Months Ended
	Jun. 30, 2014
Range01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower limit	$ 23.78
Range of Exercise Prices - Upper limit	$ 23.78
Number of shares outstanding (in Shares)	10,800
Options outstanding weighted average remaining contractual life (Years)	25 days
Options outstanding weighted average exercise price	$ 23.78
Number of shares exercisable (in Shares)	10,800
Options exercisable weighted average exercise price	$ 23.78
Range 02 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower limit	$ 24.50
Range of Exercise Prices - Upper limit	$ 24.50
Number of shares outstanding (in Shares)	22,800
Options outstanding weighted average remaining contractual life (Years)	328 days
Options outstanding weighted average exercise price	$ 24.50
Number of shares exercisable (in Shares)	22,800
Options exercisable weighted average exercise price	$ 24.50
Range 03 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower limit	$ 26.19
Range of Exercise Prices - Upper limit	$ 27.67
Number of shares outstanding (in Shares)	38,700
Options outstanding weighted average remaining contractual life (Years)	1 year 321 days
Options outstanding weighted average exercise price	$ 26.21
Number of shares exercisable (in Shares)	38,700
Options exercisable weighted average exercise price	$ 26.21
Range 04 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower limit	$ 28.42
Range of Exercise Prices - Upper limit	$ 28.42
Number of shares outstanding (in Shares)	38,500
Options outstanding weighted average remaining contractual life (Years)	2 years 335 days
Options outstanding weighted average exercise price	$ 28.42
Number of shares exercisable (in Shares)	38,500
Options exercisable weighted average exercise price	$ 28.42
Range 05 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower limit	$ 30.31
Range of Exercise Prices - Upper limit	$ 30.31
Number of shares outstanding (in Shares)	40,250
Options outstanding weighted average remaining contractual life (Years)	3 years 332 days
Options outstanding weighted average exercise price	$ 30.31
Number of shares exercisable (in Shares)	40,250
Options exercisable weighted average exercise price	$ 30.31