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Note 9 - Pensions and Other Postretirement Benefits - Amounts Recognized in the Company's Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in plan assets:      
Plan assets at beginning of year $ 80,285    
Plan assets at end of year 77,067 $ 80,285  
Pension Plan [Member]      
Benefit obligation at beginning of year 81,325 67,578  
Service cost 2,709 2,204 $ 2,408
Interest cost 1,937 2,454 2,552
Settlement 1,854 0  
Benefits paid (12,872) (3,735)  
Effect of foreign exchange 0  
Actual expenses (150) 0  
Actuarial loss 11,496 12,824  
Benefit obligation at end of year 86,299 81,325 67,578
Change in plan assets:      
Plan assets at beginning of year 80,285 72,395  
Actual return on plan assets 7,804 11,625  
Employer contributions 2,000 0  
Benefits paid (12,872) (3,735)  
Actual expenses (150) 0  
Plan assets at end of year 77,067 80,285 72,395
Funded status at end of year (9,232) (1,040)  
Current liabilities 0 0  
Noncurrent liabilities (9,232) (1,040)  
Total assets (liabilities) (9,232) (1,040)  
Net actuarial loss 28,896 26,192  
Prior Service Cost 0 0  
Deferred tax (benefit) expense (7,130) (6,499)  
After tax actuarial loss (gain) 21,766 19,693  
Postretirement Plan [Member]      
Benefit obligation at beginning of year 26,055 23,679  
Service cost 1,372 1,083 775
Interest cost 778 941 561
Settlement 0 0  
Benefits paid (1,305) (2,311)  
Effect of foreign exchange 9 16  
Actual expenses 0 0  
Actuarial loss 2,939 2,647  
Benefit obligation at end of year 29,848 26,055 23,679
Change in plan assets:      
Plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 1,305 2,311  
Benefits paid (1,305) (2,311)  
Actual expenses 0 0  
Plan assets at end of year 0 0 $ 0
Funded status at end of year (29,848) (26,055)  
Current liabilities (1,598) (1,602)  
Noncurrent liabilities (28,250) (24,453)  
Total assets (liabilities) (29,848) (26,055)  
Net actuarial loss 7,834 5,205  
Prior Service Cost (3,255) (4,383)  
Deferred tax (benefit) expense (1,012) (132)  
After tax actuarial loss (gain) $ 3,567 $ 690