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Note 10 - Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Settlement loss $ (6,400) $ (2,300) $ (4,600)
Pension Plan [Member]      
Service cost 2,400 2,662 2,709
Interest cost 2,326 1,729 1,937
Expected return on plan assets (2,892) (3,610) (3,900)
Recognized actuarial loss 1,724 1,904 2,160
Settlement loss 6,427 2,304 4,583
Net periodic benefit cost 9,985 4,989 7,489
Net (gain) loss (7,726) (2,879) 2,704
Total expense recognized in net periodic benefit cost and other comprehensive income 2,259 2,110 10,193
Postemployment Retirement Benefits [Member]      
Service cost 1,146 1,462 1,372
Interest cost 760 654 778
Recognized actuarial loss 368 580 306
Net periodic benefit cost 1,146 1,566 1,327
Net (gain) loss (4,317) (863) 3,762
Total expense recognized in net periodic benefit cost and other comprehensive income (3,171) 703 5,089
Prior service cost recognition $ (1,128) $ (1,130) $ (1,129)