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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, 2020
Mar. 31, 2019
Pension Plan [Member]    
Service cost $ 684 $ 567
Interest cost 535 646
Expected return on plan assets (985) (945)
Amortization of prior service cost
Recognized actuarial loss 513 391
Settlement loss 1,478
Net periodic benefit cost (gain) [1] 2,225 659
Postemployment Retirement Benefits [Member]    
Service cost 343 271
Interest cost 194 235
Expected return on plan assets
Amortization of prior service cost (282) (282)
Recognized actuarial loss 77 7
Settlement loss
Net periodic benefit cost (gain) [1] $ 332 $ 231
[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.