Note 13 - Employee Benefit Plans (Details) - Stock Options Oustanding by Range of Exercise Prices shares in Thousands	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	$ 15.55
Range of excercise prices, maximum	$ 48.13
Options outstanding, number of shares (in Shares) | shares	485
Options outstanding, weighted average remaining contractual life	7 years 69 days
Options outstanding, weighted average exercise price	$ 40.59
Options exercisable, number of shares (in Shares) | shares	238
Options exercisable, weighted average excercise price	$ 36.90
Range01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	15.55
Range of excercise prices, maximum	$ 21.29
Options outstanding, number of shares (in Shares) | shares	24
Options outstanding, weighted average remaining contractual life	4 years 313 days
Options outstanding, weighted average exercise price	$ 19.41
Options exercisable, number of shares (in Shares) | shares	13
Options exercisable, weighted average excercise price	$ 18.53
Range 02 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	21.51
Range of excercise prices, maximum	$ 21.51
Options outstanding, number of shares (in Shares) | shares	2
Options outstanding, weighted average remaining contractual life	4 years 18 days
Options outstanding, weighted average exercise price	$ 21.51
Options exercisable, number of shares (in Shares) | shares	2
Options exercisable, weighted average excercise price	$ 21.51
Range 03 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	26.19
Range of excercise prices, maximum	$ 26.19
Options outstanding, number of shares (in Shares) | shares	25
Options outstanding, weighted average remaining contractual life	138 days
Options outstanding, weighted average exercise price	$ 26.19
Options exercisable, number of shares (in Shares) | shares	25
Options exercisable, weighted average excercise price	$ 26.19
Range 04 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	28.42
Range of excercise prices, maximum	$ 28.42
Options outstanding, number of shares (in Shares) | shares	27
Options outstanding, weighted average remaining contractual life	1 year 131 days
Options outstanding, weighted average exercise price	$ 28.42
Options exercisable, number of shares (in Shares) | shares	27
Options exercisable, weighted average excercise price	$ 28.42
Range 05 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	30.31
Range of excercise prices, maximum	$ 30.31
Options outstanding, number of shares (in Shares) | shares	30
Options outstanding, weighted average remaining contractual life	2 years 98 days
Options outstanding, weighted average exercise price	$ 30.31
Options exercisable, number of shares (in Shares) | shares	30
Options exercisable, weighted average excercise price	$ 30.31
Range 06 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	40.57
Range of excercise prices, maximum	$ 40.57
Options outstanding, number of shares (in Shares) | shares	49
Options outstanding, weighted average remaining contractual life	7 years 229 days
Options outstanding, weighted average exercise price	$ 40.57
Options exercisable, number of shares (in Shares) | shares	49
Options exercisable, weighted average excercise price	$ 40.57
Range 07 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	40.72
Range of excercise prices, maximum	$ 40.72
Options outstanding, number of shares (in Shares) | shares	2
Options outstanding, weighted average remaining contractual life	8 years 321 days
Options outstanding, weighted average exercise price	$ 40.72
Options exercisable, weighted average excercise price	40.72
Range08 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	44.40
Range of excercise prices, maximum	$ 44.40
Options outstanding, number of shares (in Shares) | shares	65
Options outstanding, weighted average remaining contractual life	7 years 200 days
Options outstanding, weighted average exercise price	$ 44.40
Options exercisable, number of shares (in Shares) | shares	14
Options exercisable, weighted average excercise price	$ 44.40
Range09 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	45.50
Range of excercise prices, maximum	$ 45.50
Options outstanding, number of shares (in Shares) | shares	258
Options outstanding, weighted average remaining contractual life	9 years 18 days
Options outstanding, weighted average exercise price	$ 45.50
Options exercisable, number of shares (in Shares) | shares	77
Options exercisable, weighted average excercise price	$ 45.50
Range10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of excercise prices, minimum	48.13
Range of excercise prices, maximum	$ 48.13
Options outstanding, number of shares (in Shares) | shares	3
Options outstanding, weighted average remaining contractual life	9 years 259 days
Options outstanding, weighted average exercise price	$ 48.13
Options exercisable, number of shares (in Shares) | shares	1
Options exercisable, weighted average excercise price	$ 48.13