Note 14 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions and Methodology [Table Text Block]

	2019			2018
Dividend yield		2.52	%		2.56	%
Expected volatility		20.40	%		20.17	%
Risk free interest rate		2.55	%		2.96	%
Expected life of SARs (in years)		7.2			7.0

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three months ended March 31, 2019
(In thousands)	Stock Appreciation Rights			Restricted Stock Awards			Restricted Stock Units			Performance Stock Units			Total
Expense	$	84		$	293		$	81		$	405		$	863
Deferred tax benefit		(18	)		(61	)		(17	)		(85	)		(181	)
Total net expense	$	66		$	232		$	64		$	320		$	682

	Three months ended March 31, 2018
(In thousands)	Stock Appreciation Rights			Restricted Stock Awards			Restricted Stock Units			Performance Stock Units			Total
Expense	$	73		$	276		$	63		$	411		$	823
Deferred tax benefit		(15	)		(58	)		(13	)		(87	)		(173	)
Total net expense	$	58		$	218		$	50		$	324		$	650

Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block]

(In thousands)	Stock
Year ended	Appreciation Rights		Restricted Stock Awards		Restricted Stock Units		Performance Stock Units		Total
Remainder of 2019	$	253	$	900	$	248	$	1,215	$	2,616
2020		293		1,053		2		947		2,295
2021		235		833		-		466		1,534
2022		181		561		-		-		742
2023		105		310		-		-		415
2024		7		25		-		-		32
Total estimated expense	$	1,074	$	3,682	$	250	$	2,628	$	7,634

Share-based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]

													Weighted
							Weighted				Weighted		average
							average		Aggregate		average		remaining
				Exercise			exercise		intrinsic		fair		contractual
(In thousands, except per share data)	SARs			price			price		value(1)		value		life (in years)
Outstanding, January 1, 2018		704		$14.02	-	$40.00	$	19.51	$	12,923	$	3.47		5.1
Granted		100		35.90	-	39.32		37.75		-		6.07
Exercised		(73	)	14.02	-	19.37		15.32		1,654		3.43
Forfeited		-			-			-		-		-
Outstanding, December 31, 2018		731		$14.02	-	$40.00	$	22.42	$	8,422	$	3.82		5.2
Outstanding, January 1, 2019		731		$14.02	-	$40.00	$	22.42	$	8,422	$	3.82
Granted		40		36.65	-	36.65		36.65		-		6.61
Exercised		(26	)	14.02	-	19.37		14.71		529		3.55
Forfeited		-			-			-		-		-
Outstanding, March 31, 2019		745		$14.02	-	$40.00	$	23.45	$	8,639	$	3.98		5.4
Vested and exercisable		535		$14.02	-	$40.00	$	19.01	$	8,169	$	3.35		4.1
Unvested		210		19.44	-	40.00		34.78		470		5.60		8.6
Outstanding, March 31, 2019		745		$14.02	-	$40.00	$	23.45	$	8,639	$	3.98		5.4
Vested at March 31, 2019		69		$19.37	-	$40.00	$	26.77	$	574	$	4.44

Schedule of Nonvested Share Activity [Table Text Block]

(In thousands, except per share data)	RSAs			Grant date weighted average cost
Unvested at January 1, 2018		119		$	27.62
Shares awarded		40			35.89
Restrictions lapsed and shares released		(44	)		23.62
Shares forfeited		(5	)		31.35
Unvested at December 31, 2018		110		$	32.09
Unvested at January 1, 2019		110		$	32.09
Shares awarded		39			34.88
Restrictions lapsed and shares released		(39	)		28.66
Shares forfeited		-			-
Unvested at March 31, 2019		110		$	34.31

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	Vesting				Expected
Grant	period		Fair		shares to
year	in years		value		be awarded
2017		3	$	35.66		61,893
2018		3		31.54		50,352
2019		3		32.03		43,602