Note 17 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 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			2017
Dividend yield		2.54	%		2.56	%		2.72	%
Expected volatility		20.39	%		20.17	%		19.47	%
Risk free interest rate		2.52	%		2.96	%		2.29	%
Expected life of SARs (years)	7.2			7.0			7.0

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

	Year Ended December 31, 2019
(in thousands)	Stock Appreciation Rights			Restricted Stock Awards			Restricted Stock Units			Performance Stock Units			Total
Expense	$	345		$	1,185		$	329		$	1,719		$	3,578
Deferred tax benefit		(72	)		(249	)		(69	)		(361	)		(751	)
Total net expense	$	273		$	936		$	260		$	1,358		$	2,827

	Year Ended December 31, 2018
(in thousands)	Stock Appreciation Rights			Restricted Stock Awards			Restricted Stock Units			Performance Stock Units			Total
Expense	$	379		$	1,100		$	248		$	2,300		$	4,027
Deferred tax benefit		(80	)		(231	)		(52	)		(483	)		(846	)
Total net expense	$	299		$	869		$	196		$	1,817		$	3,181

	Year Ended December 31, 2017
(in thousands)	Stock Appreciation Rights			Restricted Stock Awards			Restricted Stock Units			Performance Stock Units			Total
Expense	$	280		$	1,032		$	219		$	1,361		$	2,892
Deferred tax benefit		(59	)		(216	)		(46	)		(286	)		(607	)
Total net expense	$	221		$	816		$	173		$	1,075		$	2,285

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

(in thousands) Year ended	Stock Appreciation Rights		Restricted Stock Awards		Restricted Stock Units		Performance Stock Units		Total
2020	$	306	$	1,035	$	2	$	853	$	2,196
2021		248		816		—		462		1,526
2022		193		547		—		—		740
2023		118		302		—		—		420
2024		11		24		—		—		35
2025		—		—		—		—		-
Total estimated expense	$	876	$	2,724	$	2	$	1,315	$	4,917

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 and years)	SARs			price			price		value(1)		value		life (in years)
Outstanding, January 1, 2017		735		$14.02	-	$33.08	$	17.78	$	21,443	$	3.26		5.5
Granted		46		40.00	-	40.00		40.00		—		6.34
Exercised		(77	)	14.02	-	17.89		15.41		1,855		3.18
Forfeited		—			-			-		—		—
Outstanding, December 31, 2017		704		$14.02	-	$40.00	$	19.51	$	12,923	$	3.47		5.1
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	$	3.83		5.2
Outstanding, January 1, 2019		731		$14.02	-	$40.00	$	22.42	$	8,422	$	3.83		5.2
Granted		53		36.65	-	38.18		37.01		213		6.24
Exercised		(143	)	14.02	-	22.96		15.99		3,025		3.47
Forfeited		—			-			-		—		—
Outstanding, December 31, 2019		641		$14.02	-	$40.00	$	25.06	$	10,250	$	4.10		5.3
Vested and exercisable		439		$14.02	-	$40.00	$	20.53	$	9,017	$	3.42		4.0
Unvested		202		22.96	-	40.00		34.93		1,233		5.59		7.9
Outstanding, December 31, 2019		641		$14.02	-	$40.00	$	25.06	$	10,250	$	4.10		5.3
Vested during 2019		91		$19.37	-	$40.00	$	28.80	$	1,110	$	4.66

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights, Award Expiration Period [Table Text Block]

(in thousands, except per share data)
Expiration	SARs Outstanding		SARs Exercisable		Weighted Average Exercise Price
2020		3		3	$	14.02
2021		27		27		15.88
2022		108		108		15.25
2023		80		80		15.26
2024		73		73		19.37
2025		63		49		23.00
2026		88		55		25.84
2027		46		21		40.00
2028		100		23		37.75
2029		53		—		37.01
		641		439	$	25.06

Schedule of Nonvested Share Activity [Table Text Block]

				Grant date
				weighted
(in thousands, except per share data)	RSAs			average cost
Unvested at January 1, 2017		145		$	21.57
Shares awarded		29			44.85
Restrictions lapsed and shares released		(47	)		19.79
Shares forfeited		(8	)		25.18
Unvested at December 31, 2017		119		$	27.62
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		40			34.88
Restrictions lapsed and shares released		(40	)		28.74
Shares forfeited		(2	)		35.36
Unvested at December 31, 2019		108		$	34.31

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

Grant Year	Vesting Period in Years	Fair Value		Expected Shares to be Awarded
2017	3	$	35.66	61,893
2018	3		31.54	50,352
2019	3		32.03	43,603

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Issued Upon Exercise and Remaining Shares Available for Future Issuance [Table Text Block]

	Number of				Shares
	shares to be		Weighted		available for
	issued upon		average		future
Plan category (in thousands)	exercising/vesting		exercise price		issuance (a)
Equity compensation plans approved by security holders:
Stock Appreciation Rights	(b)		(b)			547
Restricted Stock Awards		108		N/A	(a)
Restricted Stock Units		10		N/A	(a)
Performance Stock Units	(c)			N/A	(a)
Total shares		118				547