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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, 2023
Mar. 31, 2022
Pension Plan [Member]    
Service cost $ 530 $ 664
Interest cost 635 454
Expected return on plan assets 657 812
Amortization of prior service cost 0 0
Recognized actuarial loss (301) (454)
Net periodic benefit cost (a) 809 760
Postemployment Retirement Benefits [Member]    
Service cost 208 287
Interest cost 299 190
Expected return on plan assets (0) (0)
Amortization of prior service cost (248) (283)
Recognized actuarial loss 9 (92)
Net periodic benefit cost (a) $ 250 $ 286