Note 12 - Retirement Plans and Other Postretirement Benefits - Components of the Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension income			$ (72,000)	$ (49,000)
Pension Plan [Member] | UNITED STATES
Service cost	$ 4	$ 3	7	6
Interest cost	29	17	58	32
Expected return on plan assets	(64)	(44)	(128)	(88)
Prior service cost (credit)	1	(1)	3	(3)
Actuarial (gain) loss	(7)	0	(14)	0
Pension income	(37)	(25)	(74)	(53)
Pension Plan [Member] | Foreign Plan [Member]
Service cost	0	1	1	2
Interest cost	5	2	10	4
Expected return on plan assets	(5)	(3)	(10)	(7)
Prior service cost (credit)	0	0	0	0
Actuarial (gain) loss	1	2	1	5
Pension income	$ 1	$ 2	$ 2	$ 4