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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension Plan [Member]        
Service cost $ 688 $ 551 $ 2,029 $ 1,653
Interest cost 431 614 1,522 1,841
Expected return on plan assets (984) (890) (2,928) (2,671)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss 538 431 1,673 1,294
Settlement loss 991 0 4,373 0
Net periodic benefit cost (gain) [1] 1,664 706 6,669 2,117
Postemployment Retirement Benefits [Member]        
Service cost 343 271 1,029 812
Interest cost 194 235 584 706
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (282) (282) (847) (846)
Recognized actuarial loss 77 7 230 21
Settlement loss 0 0 0 0
Net periodic benefit cost (gain) [1] $ 332 $ 231 $ 996 $ 693
[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.