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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Recognized actuarial (gain) loss $ 27 $ (413) $ (677)
Settlement loss 0 (2,900) (4,000)
Net loss (gain) 3,749 9,096 (4,105)
Recognized actuarial loss (gain) 27 (413) (677)
Pension Plan [Member]      
Service cost 2,204 2,408 2,727
Interest cost 2,454 2,552 2,537
Expected return on plan assets (3,561) (4,481) (4,697)
Recognized actuarial (gain) loss 1,726 1,577 1,770
Settlement loss 2,852 4,031
Net periodic benefit (credit) cost 2,823 4,908 6,368
Total expense (benefit) recognized in net periodic benefit cost and other comprehensive income 5,857 3,495 3,898
Service cost 2,204 2,408 2,727
Interest cost 2,454 2,552 2,537
Recognized actuarial loss (gain) 1,726 1,577 1,770
Postretirement Plan [Member]      
Service cost 1,083 775 1,249
Interest cost 941 561 814
Net periodic benefit (credit) cost 922 (205) 1,386
Net loss (gain) 3,034 (1,413) (2,470)
Total expense (benefit) recognized in net periodic benefit cost and other comprehensive income 4,671 8,891 (2,719)
Service cost 1,083 775 1,249
Interest cost 941 561 814
Prior service cost recognition $ (1,129) $ (1,128)