Note 9 - Employee Retirement Plans - Net Funded Status (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Benefit obligation at beginning of the period		$ 50,097	$ 64,273	$ 84,308
Interest cost		2,572	2,873	2,313
Benefits paid		(4,371)	(5,104)	(5,667)
Actuarial (gain) loss (A)	[1]	(250)	1,916	(16,681)
Settlement		0	(13,861)	0
Benefit obligation at end of the period		48,048	50,097	64,273
Fair value of plan assets at beginning of the period		30,843	45,378	56,779
Actual return		2,184	2,827	(7,337)
Defined Benefit Plan, Plan Assets, Contributions by Employer		1,599	1,603	1,603
Benefits paid		(4,371)	(5,104)	(5,667)
Settlement		0	(13,861)	0
Fair value of plan assets at end of the period		30,255	30,843	45,378
Unfunded status at end of the period		(17,793)	(19,254)	(18,895)
Current liabilities		(1,567)	(1,572)	(1,575)
Noncurrent liabilities		(16,226)	(17,682)	(17,320)
Net amount recognized		$ (17,793)	$ (19,254)	$ (18,895)

[1] The change in the actuarial (gain) loss for the three years ended December 31, 2024 was primarily attributable to changes in the discount rate.