Note 12 - Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used

	2013			2012
Risk–free interest rate		0.15	%		0.28	%
Expected volatility		22.5	%		38.8	%
Expected life, in years		1.0			2.1
Expected dividend yield		2.55	%		2.91	%

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, 2012		1,482,077		$	46.92	$	–
Options granted		63,516			44.24		–
Options exercised		(295,371	)		45.41		–
Options cancelled		(115,620	)		50.99		–
Options outstanding at December 31, 2012		1,134,602			46.75		–
Options granted		21,640			49.50		–
Options outstanding at March 31, 2013		1,156,242		$	46.80	$	265,000
Options exercisable at March 31, 2013		197,602		$	47.03	$	265,000

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

Options Outstanding March 31, 2013		Exercise Prices				Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years
	28,800			37.70			37.70		1.1
	1,015,802		45.80	–	46.69		46.58		3.0
	111,640		49.50	–	51.50		51.11		0.2
	1,156,242						46.80		2.7

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

	Number of Shares		Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
Non–vested restricted shares at January 1, 2012		24,000	$	34.46	$	–
Award shares granted		–		–		–
Award shares vested		6,000		34.46		–
Non–vested restricted shares at December 31, 2012		18,000		34.46		–
Award shares granted		–		–		–
Award shares vested		–		–		–
Non–vested restricted shares at March 31, 2013		18,000	$	34.46	$	203,000