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Note 7 - Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Plan [Member]    
Service cost $ 749 $ 684
Interest cost 392 535
Expected return on plan assets (895) (985)
Amortization of prior service cost 0 0
Recognized actuarial loss 515 513
Settlement loss 0 1,478
Net periodic benefit cost (gain) [1] 761 2,225
Postemployment Retirement Benefits [Member]    
Service cost 365 343
Interest cost 163 194
Expected return on plan assets 0 0
Amortization of prior service cost (282) (282)
Recognized actuarial loss 145 77
Settlement loss 0 0
Net periodic benefit cost (gain) [1] $ 391 $ 332
[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.