Note 11 - Employee Retirement Plans - Benefit Obligation and Funded Status (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan [Member] | UNITED STATES
Benefit obligation at beginning of year		$ 3,182,000	$ 4,075,000
Service cost		80,000	105,000	$ 102,000
Interest cost		168,000	98,000	78,000
Plan amendments			28,000
Actuarial gain		89,000	(925,000)
Other (1)	[1]	14,000	3,000
Benefits paid		(222,000)	(202,000)
Benefit obligation at end of year		3,311,000	3,182,000	4,075,000
Balance		2,683,000	3,598,000
Actual gain (loss) on plan assets		281,000	(728,000)
Defined Benefit Plan, Plan Assets, Contributions by Employer		18,000	15,000
Benefits paid		(222,000)	(202,000)
Balance		2,760,000	2,683,000	3,598,000
Fair value of plan assets		2,760,000	2,683,000	3,598,000
Benefit obligations		3,311,000	3,182,000	4,075,000
Funded status of plans		(551,000)	(499,000)
Current liability		(17,000)	(18,000)
Noncurrent liability		(534,000)	(481,000)
Recognized liability		(551,000)	(499,000)
Net actuarial loss (gain)		259,000	259,000
Prior service cost (credit)		34,000	44,000
Amounts recognized at end of year		293,000	303,000
Pension Plan [Member] | Foreign Plan [Member]
Benefit obligation at beginning of year		549,000	736,000
Service cost		18,000	22,000	25,000
Interest cost		20,000	11,000	10,000
Actuarial gain		9,000	(137,000)
Other (1)	[1]	(3,000)	(1,000)
Benefits paid		(25,000)	(21,000)
Foreign currency translation		10,000	(61,000)
Benefit obligation at end of year		578,000	549,000	736,000
Balance		381,000	584,000
Actual gain (loss) on plan assets		10,000	(139,000)
Defined Benefit Plan, Plan Assets, Contributions by Employer		32,000	8,000
Benefits paid		(25,000)	(21,000)
Foreign currency translation		7,000	(51,000)
Balance		405,000	381,000	584,000
Fair value of plan assets		405,000	381,000	584,000
Benefit obligations		578,000	549,000	736,000
Funded status of plans		(173,000)	(168,000)
Noncurrent asset		24,000	26,000
Current liability		(8,000)	(7,000)
Noncurrent liability		(189,000)	(187,000)
Recognized liability		(173,000)	(168,000)
Net actuarial loss (gain)		10,000	(2,000)
Prior service cost (credit)			(1,000)
Amounts recognized at end of year		10,000	(3,000)
Other Postretirement Benefits Plan [Member]
Benefit obligation at beginning of year		434,000	654,000
Service cost		5,000	9,000	10,000
Interest cost		23,000	15,000	15,000
Plan participants’ contributions		9,000	7,000
Actuarial gain		(7,000)	(209,000)
Other (1)	[1]	1,000
Benefits paid		(40,000)	(42,000)
Benefit obligation at end of year		425,000	434,000	654,000
Balance		5,000	9,000
Defined Benefit Plan, Plan Assets, Contributions by Employer		26,000	31,000
Plan participants’ contributions		9,000	7,000
Benefits paid		(40,000)	(42,000)
Balance		0	5,000	9,000
Fair value of plan assets		0	5,000	9,000
Benefit obligations		425,000	434,000	$ 654,000
Funded status of plans		(425,000)	(429,000)
Current liability		(27,000)	(22,000)
Noncurrent liability		(398,000)	(407,000)
Recognized liability		(425,000)	(429,000)
Net actuarial loss (gain)		(212,000)	(226,000)
Prior service cost (credit)		(10,000)	(15,000)
Amounts recognized at end of year		(222,000)	(241,000)
Other Postretirement Benefits Plan [Member] | UNITED STATES
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 0	$ 0

[1] Other consists of domestic plan special termination benefits charge and curtailment and international plan settlements. Refer to Note 2 (Restructuring, Impairment and Other Charges and Credits) in the notes to the consolidated financial statements for more information.