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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, 2022
Mar. 31, 2021
Pension Plan [Member]    
Service cost $ 664 $ 749
Interest cost 454 392
Expected return on plan assets (812) (895)
Amortization of prior service cost 0 0
Recognized actuarial loss 454 515
Net periodic benefit cost (gain) [1] 760 761
Postemployment Retirement Benefits [Member]    
Service cost 287 365
Interest cost 190 163
Expected return on plan assets 0 0
Amortization of prior service cost (283) (282)
Recognized actuarial loss 92 145
Net periodic benefit cost (gain) [1] $ 286 $ 391
[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.