Note 13 - Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2014			2013
Risk-free interest rate		0.52	%		0.25	%
Expected volatility		17.3	%		31.1	%
Expected life, in years		2.2			2.1
Expected dividend yield		2.68	%		2.81	%

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of Shares			Weighted Average Exercise Price		Aggregate Intrinsic Value
Options outstanding at January 1, 2013		1,134,602		$	46.75	$	-
Options granted		59,472			47.95		-
Options exercised		(21,522	)		45.63		-
Options cancelled		(98,000	)		51.11		-
Options outstanding at December 31, 2013		1,074,552			46.44		-
Options granted		58,090			53.11		-
Options exercised		(145,074	)		45.32		-
Options cancelled		(20,000	)		46.69		-
Options outstanding at September 30, 2014		967,568		$	47.01	$	8,227,000
Options exercisable at September 30, 2014		158,573		$	48.06	$	1,182,000

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Options Outstanding September 30, 2014		Exercise Prices	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years
	909,678	$44.80 - $47.45	$	46.62		1.6
	57,890	$52.93 - $53.72		53.11		3.7
	967,568		$	47.01		1.7

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number of Shares		Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested restricted shares at January 1, 2013		18,000	$	34.46	$	-
Award shares granted		-		-		-
Award shares vested		6,000		34.46		-
Non-vested restricted shares at December 31, 2013		12,000		34.46		-
Award shares granted		-		-		-
Award shares vested		6,000		34.46		-
Non-vested restricted shares at September 30, 2014		6,000	$	34.46	$	126,000