Note 9 - Employee Retirement Plans - Net Funded Status (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Benefit obligation at beginning of the period		$ 84,308	$ 88,960	$ 91,654
Service cost		0	0	112
Interest cost		2,313	2,168	2,907
Benefits paid		(5,667)	(5,693)	(5,990)
Actuarial (gain) loss (A)	[1]	(16,681)	(1,127)	5,277
Settlement		0	0	(4,407)
Foreign currency exchange rate changes		0	0	(593)
Benefit obligation at end of the period		64,273	84,308	88,960
Fair value of plan assets at beginning of the period		56,779	56,495	59,625
Actual return		(7,337)	4,374	6,890
Actuarial loss		0	0	18
Administrative expenses		0	0	(49)
Defined Benefit Plan, Plan Assets, Contributions by Employer		1,603	1,603	1,615
Benefits paid		(5,667)	(5,693)	(5,990)
Settlement		0	0	(5,000)
Foreign currency exchange rate changes		0	0	(614)
Fair value of plan assets at end of the period		45,378	56,779	56,495
Unfunded status at end of the period		(18,895)	(27,529)	(32,465)
Current liabilities		(1,575)	(1,578)	(1,524)
Noncurrent liabilities		(17,320)	(25,951)	(30,941)
Net amount recognized		$ (18,895)	$ (27,529)	$ (32,465)

[1] The change in the actuarial (gain) loss for the three years ended December 31, 2021 was primarily attributable to changes in the discount rate.