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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Settlement loss   $ (1,000)   $ (4,400)
Pension Plan [Member]        
Service cost $ 636 688 $ 2,034 2,029
Interest cost 467 431 1,252 1,522
Expected return on plan assets (907) (984) (2,707) (2,928)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss 423 538 1,482 1,673
Settlement loss 388 991 2,116 4,373
Net periodic benefit cost (gain) [1] 1,007 1,664 4,177 6,669
Postemployment Retirement Benefits [Member]        
Service cost 365 343 1,096 1,029
Interest cost 163 194 490 584
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (282) (282) (847) (847)
Recognized actuarial loss 145 77 435 230
Settlement loss 0 0 0 0
Net periodic benefit cost (gain) [1] $ 391 $ 332 $ 1,174 $ 996
[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.