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Note 14 - Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

		Stock Options Outstanding								Stock Awards Outstanding								Stock Units Outstanding
		Number of Shares (000)				Weighted Average Exercise Price				Number of Shares (000)				Weighted Average Exercise Price				Number of Shares (000)				Weighted Average Exercise Price
Balance, December 31, 2014			240			$	13.86				454			$	15.94				--			$	--
Granted			750				22.35				190				21.73				40				18.58
Stock Options Exercised			(142	)			11.29				--				--				--				--
Stock Options from Acquisitions			132				10.22				--				--				--				--
Stock Awards/Units Vested			--				--				(262	)			17.39				--				--
Forfeited/Expired			(10	)			12.25				(40	)			17.68				--				--
Balance, December 31, 2015			970				20.31				342				17.83				40				18.58
Granted			116				23.51				272				23.46				216				23.48
Stock Options Exercised			(128	)			15.14				--				--				--				--
Stock Awards/Units Vested			--				--				(318	)			20.96				(25	)			22.77
Forfeited/Expired			(12	)			17.53				(18	)			21.85				(6	)			23.51
Balance, December 31, 2016			946				21.43				278				20.48				225				22.70
Granted			--				--				--				--				849				28.86
Stock Options Exercised			(122	)			17.66				--				--				--				--
Stock Awards/Units Vested			--				--				(91	)			19.40				(392	)			27.13
Forfeited/Expired			(12	)			22.67				(25	)			21.91				(30	)			25.76
Balance, December 31, 2017			812			$	21.98				162			$	20.86				652			$	27.92
Exercisable, December 31, 2017			711			$	21.85

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

				Options Outstanding												Options Exercisable
Range of Exercise Prices				Number of Shares (000)				Weighted Average Remaining Contractual Life (Years)				Weighted Average Exercise Price				Number of Shares (000)				Weighted Average Exercise Price
$8.78	-	$10.57			7				2.36			$	9.64				7			$	9.64
10.65	-	10.65			7				5.06				10.65				4				10.65
10.76	-	10.76			3				2.05				10.76				3				10.76
15.16	-	15.16			36				0.41				15.16				36				15.16
20.29	-	20.29			78				7.00				20.29				78				20.29
20.36	-	20.36			3				6.88				20.36				2				20.36
22.20	-	22.20			82				6.93				22.20				57				22.20
22.75	-	22.75			481				7.15				22.75				481				22.75
23.51	-	23.51			108				7.82				23.51				36				23.51
24.07	-	24.07			7				7.71				24.07				7				24.07
$8.78	-	$24.07			812				6.83			$	21.98				711			$	21.85

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

		2016				2015
Expected dividend yield			1.96	%			2.06	%
Expected stock price volatility			27.34	%			16.96	%
Risk-free interest rate			2.01	%			2.17	%
Expected life of options (in years)			7				10

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