Note 19 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

	2023			2022			2021
Dividend yield		2.24	%		2.38	%		2.52	%
Expected volatility		27.20	%		25.43	%		25.19	%
Risk free interest rate		3.84	%		1.98	%		1.22	%
Expected life of SARs (in years)	7.1			7.1			7.1

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

	Year Ended December 31, 2023
(in thousands)	Stock Appreciation Rights			Restricted Stock Awards			Restricted Stock Units			Performance Stock Units			Total
Expense	$	492		$	1,599		$	519		$	1,854		$	4,464
Deferred tax benefit		(104	)		(336	)		(109	)		(390	)		(939	)
Total net expense	$	388		$	1,263		$	410		$	1,464		$	3,525

	Year Ended December 31, 2022
(in thousands)	Stock Appreciation Rights			Restricted Stock Awards			Restricted Stock Units			Performance Stock Units			Total
Expense	$	376		$	1,373		$	332		$	2,313		$	4,394
Deferred tax benefit		(79	)		(289	)		(70	)		(486	)		(924	)
Total net expense	$	297		$	1,084		$	262		$	1,827		$	3,470

	Year Ended December 31, 2021
(in thousands)	Stock Appreciation Rights			Restricted Stock Awards			Restricted Stock Units			Performance Stock Units			Total
Expense	$	352		$	1,288		$	312		$	2,613		$	4,565
Deferred tax benefit		(74	)		(271	)		(66	)		(549	)		(960	)
Total net expense	$	278		$	1,017		$	246		$	2,064		$	3,605

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
2024	$	307	$	1,376	$	3	$	788	$	2,474
2025		248		1,155		—		668		2,071
2026		190		854		—		—		1,044
2027		111		501		—		—		612
2028		12		41		—		—		53
Total estimated expense	$	868	$	3,927	$	3	$	1,456	$	6,254

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, 2021		593		$15.24	-	$40.00	$	27.47	$	7,706	$	4.44		5.1
Granted		30		47.17	-	50.71		50.48		-		9.69
Exercised		(108	)	15.24	-	19.37		16.40		4,239		2.85
Forfeited		—			—			—		—		—
Outstanding, December 31, 2021		515		$15.24	-	$50.71	$	31.16	$	16,854	$	5.08		5.1
Outstanding, January 1, 2022		515		$15.24	-	$50.71	$	31.16	$	16,854	$	5.08		5.1
Granted		34		47.17	-	74.92		55.45		—		12.07
Exercised		(114	)	15.24	-	40.00		21.55		5,258		3.63
Forfeited		—			—			—		—		—
Outstanding, December 31, 2022		435		$19.37	-	$74.92	$	35.60	$	12,784	$	6.02		5.1
Outstanding, January 1, 2023		435		$19.37	-	$74.92	$	35.60	$	12,784	$	6.02		5.1
Granted		29		60.76	-	60.76		60.76		—		16.81
Exercised		(24	)	19.37	-	19.37		19.37		681		3.58
Forfeited		—			—			—		—		—
Outstanding, December 31, 2023		440		$19.44	-	$74.92	$	38.11	$	6,297	$	6.86		4.7
Vested and exercisable		336		$19.44	-	$74.92	$	34.15	$	5,851	$	5.50		3.8
Unvested		104		36.65	-	74.92		50.83		446		11.22		3.4
Outstanding, December 31, 2023		440		$19.44	-	$74.92	$	38.11	$	6,297	$	6.86		4.7
Vested in the current year		52		$35.90	-	$74.92	$	41.34	$	531	$	7.25

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

(in thousands, except per share data)
Expiration Year	SARs Outstanding		SARs Vested and Exercisable		Weighted Average Exercise Price
2024		3		3	$	19.44
2025		39		39		23.02
2026		76		76		25.76
2027		40		40		40.00
2028		95		95		37.84
2029		47		37		37.06
2030		46		27		37.30
2031		31		12		50.48
2032		34		7		55.45
2033		29		—		60.76
		440		336	$	38.11

Schedule of Nonvested Share Activity [Table Text Block]

				Weighted
				average cost
(in thousands, except per share data)	RSAs			at grant date
Unvested at January 1, 2021		99		$	36.85
Shares awarded		39			46.90
Restrictions lapsed and shares vested		(34	)		35.48
Shares forfeited		(5	)		40.81
Unvested at December 31, 2021		99		$	41.07
Unvested at January 1, 2022		99		$	41.07
Shares awarded		35			58.47
Restrictions lapsed and shares vested		(32	)		40.39
Shares forfeited		(6	)		47.49
Unvested at December 31, 2022		96		$	47.26
Unvested at January 1, 2023		96		$	47.26
Shares awarded		38			63.04
Restrictions lapsed and shares vested		(33	)		43.77
Shares forfeited		(3	)		53.38
Unvested at December 31, 2023		98		$	54.23

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

Grant Year	Vesting Period in Years		Fair Value		Shares Expected to be Awarded
2021		3	$	44.44		47,280
2022		3		48.48		30,118
2023		3		54.33		33,509

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)			151
Restricted Stock Awards		98		N/A	(a)
Restricted Stock Units		8		N/A	(a)
Performance Stock Units	(c)			N/A	(a)
Total shares		106				151