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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Settlement loss $ (4,800) $ (400) $ (6,400) $ (2,100)
Pension Plan [Member]        
Service cost 496 636 1,642 2,034
Interest cost 580 467 1,745 1,252
Expected return on plan assets (665) (907) (2,169) (2,707)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss 379 423 1,314 1,482
Settlement loss 4,759 388 6,355 2,116
Net periodic benefit cost (a) [1] 5,549 1,007 8,887 4,177
Postemployment Retirement Benefits [Member]        
Service cost 287 365 860 1,096
Interest cost 190 163 570 490
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (282) (282) (847) (847)
Recognized actuarial loss 92 145 276 435
Settlement loss 0 0 0 0
Net periodic benefit cost (a) [1] $ 287 $ 391 $ 859 $ 1,174
[1] The components of net periodic benefit cost other than the service cost component are included in Other income (expense), net in the Consolidated Statements of Income.