Note 8 - Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

				Options Outstanding								Options Exercisable
				At December 31, 2023						For the Year Ended December 31, 2023		At December 31, 2023						For the Year Ended December 31, 2023
Range of Exercise Price				Number Outstanding		Aggregate Intrinsic Value		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price		Number Exercisable		Aggregate Intrinsic Value		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price
				(In thousands)				(Years)				(In thousands)				(Years)
$	40	-	45		12	$	149		1.9	$	42		12	$	149		1.9	$	42
	45	-	50		-		-		-		-		-		-		-		-
	50	-	55		4		8		0.1		53		4		8		0.1		53
	55	-	60		572		-		7.6		57		213		-		6.1		58
	60	-	65		247		-		4.6		62		247		-		4.6		62
	65	-	70		138		-		6.1		66		138		-		6.1		66
$	40	-	70		973	$	157		6.5		60		614	$	157		5.4		61

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

	For the Years Ended December 31,
	2023			2022			2021
Expected volatility (1)		20	%		19	%		20	%
Expected life in years (2)		4.7			4.6			4.7
Risk-free interest rate (3)		3.60	%		1.73	%		0.46	%
Expected dividend yield		3.66	%		3.02	%		2.79	%
Fair value per award	$	8.50		$	7.90		$	7.50

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
	(In thousands)					(Years)
Outstanding at January 1, 2023		854		$	60.02
Granted		225			55.47
Exercised		(22	)		43.30
Forfeited or expired		(84	)		55.26
Outstanding at December 31, 2023		973			59.50		6.5
Exercisable at December 31, 2023		614			61.17		5.4

Schedule of Nonvested Share Activity [Table Text Block]

	Shares			Weighted Average Grant Date Fair Value
	(In thousands)
Nonvested at January 1, 2023		346		$	7.88
Granted		225			8.50
Vested		(164	)		7.99
Forfeited		(48	)		8.18
Nonvested at December 31, 2023		359		$	8.18

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

	2023			2022
	(In thousands)
Outstanding at January 1,		31			30
Granted		12			12
Issued upon vesting		(9	)		(8	)
Forfeited		(2	)		(3	)
Outstanding at December 31,		32			31