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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Settlement loss $ 1,600 $ 1,700 $ (1,600) $ (1,700)
Pension Plan [Member]        
Service cost 482 649 1,146 1,398
Interest cost 711 394 1,165 785
Expected return on plan assets (692) (906) (1,504) (1,800)
Amortization of prior service cost   0   0
Recognized actuarial loss 481 544 935 1,059
Settlement loss 1,597 1,728 1,597 1,728
Net periodic benefit cost (a) [1] 2,579 2,409 3,339 3,170
Postemployment Retirement Benefits [Member]        
Service cost 287 365 573 731
Interest cost 190 163 380 327
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (283) (282) (565) (565)
Recognized actuarial loss 92 145 184 290
Settlement loss   0   0
Net periodic benefit cost (a) [1] $ 286 $ 391 $ 572 $ 783
[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.