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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in plan assets:      
Plan assets at beginning of year $ 46,600    
Plan assets at end of year 50,649 $ 46,600  
Pension Plan [Member]      
Accumulated benefit obligation at end of year 50,114 45,756  
Current liabilities 0    
Benefit obligation at beginning of year 55,930    
Noncurrent liabilities (11,500) (9,330)  
Service cost 2,180 2,378 $ 2,662
Total assets (liabilities) (11,500) (9,330)  
Interest cost 2,652 2,326 1,729
Net actuarial loss   18,290  
Settlement 0 1,656  
Prior Service Cost 0 0  
Benefits paid (1,646) (17,826)  
Deferred tax (benefit) expense (4,803) (4,607)  
Effect of foreign exchange 0 0  
After tax actuarial loss 14,281 13,683  
Actual expenses (161) (150)  
Actuarial (gain)/ loss 3,194 (14,454)  
Benefit obligation at end of year 62,149 55,930  
Change in plan assets:      
Plan assets at beginning of year 46,600 72,658  
Actual return on plan assets 3,606    
Employer contributions 2,250 2,250  
Benefits paid (1,646) (17,826)  
Actual expenses (161) (150)  
Plan assets at end of year 50,649 46,600 72,658
Funded status at end of year (11,500) (9,330)  
Postemployment Retirement Benefits [Member]      
Accumulated benefit obligation at end of year 24,276 23,954  
Current liabilities (1,490)    
Benefit obligation at beginning of year 23,954    
Noncurrent liabilities (22,786) (22,413)  
Service cost 835 1,146 1,462
Total assets (liabilities) (24,276) (23,954)  
Interest cost 1,196 760 654
Net actuarial loss   308  
Settlement 0 0  
Prior Service Cost 0 (995)  
Benefits paid (1,796) (1,781)  
Deferred tax (benefit) expense 135 242  
Effect of foreign exchange 6 (28)  
After tax actuarial loss (101) (445)  
Actual expenses 0 0  
Actuarial (gain)/ loss   (5,077)  
Benefit obligation at end of year 24,276 23,954  
Change in plan assets:      
Plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 1,796 1,781  
Benefits paid (1,796) (1,781)  
Actual expenses 0 0  
Plan assets at end of year 0 0 $ 0
Funded status at end of year $ (24,276) $ (23,954)