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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Plan assets at beginning of year $ 50,649    
Plan assets at end of year 55,130 $ 50,649  
Plan assets at beginning of year 50,649    
Plan assets at end of year 55,130 50,649  
Plan assets at beginning of year 50,649    
Plan assets at end of year 55,130 50,649  
Pension Plan [Member]      
Accumulated benefit obligation at end of year 49,918 50,114  
Current liabilities 0    
Benefit obligation at beginning of year 62,149    
Plan assets at beginning of year 50,649 46,600  
Actual return on plan assets 2,586    
Employer contributions 5,089 2,250  
Benefits paid (2,589) (1,646)  
Settlement Payments (455) 0  
Actual expenses (150) (161)  
Plan assets at end of year 55,130 50,649 $ 46,600
Funded status at end of year (6,629) (11,500)  
Noncurrent liabilities (6,629) (11,500)  
Service cost 1,998 2,180 2,400
Total assets (liabilities) (6,629) (11,500)  
Interest cost 2,737 2,652 2,326
Net actuarial loss   19,084  
Plan Changes 0 0  
Deferred tax (benefit) expense (4,202) (4,803)  
Settlement (1) 0  
After tax actuarial loss 12,357 14,281  
Benefits paid (2,589) (1,646)  
Settlement Payments (455) 0  
Effect of foreign exchange 0 0  
Actual expenses (150) (161)  
Actuarial (gain)/ loss (1,930) 3,194  
Benefit obligation at end of year 61,759 62,149  
Plan assets at beginning of year 50,649 46,600  
Actual return on plan assets 2,586    
Employer contributions 5,089 2,250  
Benefits paid (2,589) (1,646)  
Settlement Payments (455) 0  
Actual expenses (150) (161)  
Plan assets at end of year 55,130 50,649 46,600
Funded status at end of year (6,629) (11,500)  
Change in plan assets: 61,759 62,149  
Plan assets at beginning of year 50,649 46,600  
Actual return on plan assets 2,586    
Employer contributions 5,089 2,250  
Benefits paid (2,589) (1,646)  
Settlement Payments (455) 0  
Actual expenses (150) (161)  
Plan assets at end of year 55,130 50,649 46,600
Funded status at end of year (6,629) (11,500)  
Postemployment Retirement Benefits [Member]      
Accumulated benefit obligation at end of year 23,758 24,276  
Current liabilities (1,580)    
Benefit obligation at beginning of year 24,276    
Plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 2,084 1,796  
Benefits paid (2,084) (1,796)  
Settlement Payments 0 0  
Actual expenses 0 0  
Plan assets at end of year 0 0 0
Funded status at end of year (23,758) (24,276)  
Noncurrent liabilities (22,178) (22,786)  
Service cost 851 835 1,146
Total assets (liabilities) (23,758) (24,276)  
Interest cost 1,123 1,196 760
Net actuarial loss   (236)  
Plan Changes (394) 0  
Deferred tax (benefit) expense 19 135  
Settlement 0 0  
After tax actuarial loss 271 (101)  
Benefits paid (2,084) (1,796)  
Settlement Payments 0 0  
Effect of foreign exchange (23) 6  
Actual expenses 0 0  
Actuarial (gain)/ loss   81  
Benefit obligation at end of year 23,758 24,276  
Plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 2,084 1,796  
Benefits paid (2,084) (1,796)  
Settlement Payments 0 0  
Actual expenses 0 0  
Plan assets at end of year 0 0 0
Funded status at end of year (23,758) (24,276)  
Change in plan assets: 23,758 24,276  
Plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 2,084 1,796  
Benefits paid (2,084) (1,796)  
Settlement Payments 0 0  
Actual expenses 0 0  
Plan assets at end of year 0 0 $ 0
Funded status at end of year $ (23,758) $ (24,276)