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Note 10 - Pensions and Other Postretirement Benefits - Amounts Recognized in the Company's Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Change in plan assets:      
Plan assets at beginning of year $ 72,658    
Plan assets at end of year 46,600 $ 72,658  
Pension Plan [Member]      
Accumulated benefit obligation at end of year 45,756 67,400  
Current liabilities 0 0  
Benefit obligation at beginning of year 82,000 86,299  
Noncurrent liabilities (9,352) (9,342)  
Service cost 2,400 2,662 $ 2,709
Total assets (liabilities) (9,352) (9,342)  
Interest cost 2,326 1,729 1,937
Settlement 1,656 651  
Net actuarial loss 18,290 26,016  
Benefits paid (17,826) (7,719)  
Prior Service Cost 0 0  
Effect of foreign exchange 0 0  
Deferred tax (benefit) expense (4,607) (6,446)  
Actual expenses (150) (150)  
After tax actuarial loss 13,683 19,570  
Actuarial (gain)/ loss (14,454) (1,472)  
Benefit obligation at end of year 55,952 82,000 86,299
Change in plan assets:      
Plan assets at beginning of year 72,658 77,067  
Actual return on plan assets (10,332) 1,460  
Employer contributions 2,250 2,000  
Benefits paid (17,826) (7,719)  
Actual expenses (150) (150)  
Plan assets at end of year 46,600 72,658 77,067
Funded status at end of year (9,352) (9,342)  
Postemployment Retirement Benefits [Member]      
Accumulated benefit obligation at end of year 23,954 28,934  
Current liabilities (1,541) (1,575)  
Benefit obligation at beginning of year 28,934 29,848  
Noncurrent liabilities (22,413) (27,359)  
Service cost 1,146 1,462 1,372
Total assets (liabilities) (23,954) (28,934)  
Interest cost 760 654 778
Settlement 0 0  
Net actuarial loss 308 5,841  
Benefits paid (1,781) (1,618)  
Prior Service Cost (995) (2,125)  
Effect of foreign exchange (28) 1  
Deferred tax (benefit) expense 242 (807)  
Actual expenses 0 0  
After tax actuarial loss (445) 2,909  
Actuarial (gain)/ loss (5,077) (1,413)  
Benefit obligation at end of year 23,954 28,934 29,848
Change in plan assets:      
Plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 1,781 1,618  
Benefits paid (1,781) (1,618)  
Actual expenses 0 0  
Plan assets at end of year 0 0 $ 0
Funded status at end of year $ (23,954) $ (28,934)