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Note 7 - Pension and Other Postretirement Benefits - Components of net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Settlement loss $ 0 $ (4,800) $ 0 $ (6,400)
Pension Plan [Member]        
Service cost 530 496 1,591 1,642
Interest cost 635 580 1,904 1,745
Expected return on plan assets (657) (665) (1,971) (2,169)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss 301 379 902 1,314
Settlement loss 0 4,759 0 6,355
Net periodic benefit cost (a) 809 5,549 2,426 [1] 8,887 [1]
Postemployment Retirement Benefits [Member]        
Service cost 209 287 626 860
Interest cost 299 190 897 570
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (249) (282) (746) (847)
Recognized actuarial loss (9) 92 (28) 276
Settlement loss 0 0 0 0
Net periodic benefit cost (a) $ 250 $ 287 $ 749 [1] $ 859 [1]
[1] The components of net periodic cost other than the service cost component are included in Other income (expense), net in the Consolidated Statements of Income.