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Note 9 - Pensions and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Recognized actuarial (gain) loss $ 306 $ 27 $ (413)
Settlement loss (4,600) 0 (2,900)
Net loss (gain) 3,762 3,749 9,096
Recognized actuarial loss (gain) 306 27 (413)
Pension Plan [Member]      
Service cost 2,709 2,204 2,408
Interest cost 1,937 2,454 2,552
Expected return on plan assets (3,900) (3,561) (4,481)
Recognized actuarial (gain) loss 2,160 1,726 1,577
Settlement loss 4,583 0 2,852
Net periodic benefit (credit) cost 7,489 2,823 4,908
Total expense (benefit) recognized in net periodic benefit cost and other comprehensive income 10,193 5,857 3,495
Service cost 2,709 2,204 2,408
Interest cost 1,937 2,454 2,552
Recognized actuarial loss (gain) 2,160 1,726 1,577
Postretirement Plan [Member]      
Service cost 1,372 1,083 775
Interest cost 778 941 561
Net periodic benefit (credit) cost 1,327 922 (205)
Net loss (gain) 2,704 3,034 (1,413)
Total expense (benefit) recognized in net periodic benefit cost and other comprehensive income 5,089 4,671 8,891
Service cost 1,372 1,083 775
Interest cost 778 941 561
Prior service cost recognition $ (1,129) $ (1,129) $ (1,128)