v3.26.1
Provisions for pensions - France (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
France | Present value of defined benefit obligation [member]    
Changes in net defined benefit liability (asset) [abstract]    
Obligations at beginning of year $ 17,742,000 $ 19,122,000
Service cost 1,287,000 1,154,000
Borrowing costs 644,000 539,000
Actuarial differences (1,656,000) (1,035,000)
Benefits paid (1,461,000) (894,000)
Exchange differences 2,325,000 (1,144,000)
Obligations at end of year 18,881,000 $ 17,742,000
Pension Plans | Wholly unfunded defined benefit plans [member]    
Actuarial Assumptions Used To Calculate Defined Benefit Obligation [Abstract]    
Discount rate   3.40%
Expected inflation rate   2.20%
Discretionary contributions to the defined benefit pension and postretirement plans $ 625,000  
Pension Plans | France | Wholly unfunded defined benefit plans [member]    
Actuarial Assumptions Used To Calculate Defined Benefit Obligation [Abstract]    
Discount rate 3.88%  
Expected inflation rate 2.00%  
Weighted average duration of defined benefit obligation 14 years 7 months 6 days 14 years 1 month 6 days
Pension Plans | France | Discount rates | Wholly unfunded defined benefit plans [member]    
Actuarial Assumptions Used To Calculate Defined Benefit Obligation [Abstract]    
Change in discount 1.00% 1.00%
Change in provision $ 2,119,000 $ 1,543,000
Minimum | Pension Plans | France | Wholly unfunded defined benefit plans [member]    
Actuarial Assumptions Used To Calculate Defined Benefit Obligation [Abstract]    
Salary increase 1.60% 1.60%
Retirement age 64 years 64 years
Maximum | Pension Plans | France | Wholly unfunded defined benefit plans [member]    
Actuarial Assumptions Used To Calculate Defined Benefit Obligation [Abstract]    
Salary increase 6.10% 6.10%
Retirement age 65 years 65 years