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Note 6 - Pension and Other Postretirement Benefits - Components of net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension Plan [Member]        
Service cost $ 502 $ 530 $ 1,506 $ 1,591
Interest cost 668 635 2,006 1,904
Expected return on plan assets (839) (657) (2,518) (1,971)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss (gain) 332 301 995 902
Net periodic benefit cost (a) [1] 663 809 1,989 2,426
Postemployment Retirement Benefits [Member]        
Service cost 213 209 639 626
Interest cost 285 299 857 897
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 (249) 0 (746)
Recognized actuarial loss (gain) (8) (9) (25) (28)
Net periodic benefit cost (a) [1] $ 490 $ 250 $ 1,471 $ 749
[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.