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Note 7 - Pension and Other Postretirement Benefits - Components of 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
Settlement loss $ 0 $ (1,600) $ 0 $ (1,600)
Pension Plan [Member]        
Service cost 530 482 1,060 1,146
Interest cost 635 711 1,270 1,165
Expected return on plan assets (657) (692) (1,314) (1,504)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss 301 481 601 935
Settlement loss 0 1,597 0 1,597
Net periodic benefit cost (a) [1] 809 2,579 1,617 3,339
Postemployment Retirement Benefits [Member]        
Service cost 209 287 417 573
Interest cost 299 190 598 380
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (249) (283) (497) (565)
Recognized actuarial loss (9) 92 (18) 184
Settlement loss 0 0 0 0
Net periodic benefit cost (a) [1] $ 250 $ 286 $ 500 $ 572
[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.