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Note 6 - Pension and Other Postretirement Benefits - Components of net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Plan [Member]        
Service cost $ 502 $ 530 $ 1,004 $ 1,060
Interest cost 668 635 1,337 1,270
Expected return on plan assets (839) (657) (1,678) (1,314)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss (gain) 332 301 663 601
Net periodic benefit cost (a) 663 809 1,326 [1] 1,617 [1]
Postemployment Retirement Benefits [Member]        
Service cost 213 209 426 417
Interest cost 285 299 572 598
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 (249) 0 (497)
Recognized actuarial loss (gain) (8) (9) (17) (18)
Net periodic benefit cost (a) $ 490 $ 250 $ 981 [1] $ 500 [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.