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Employee benefits (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jul. 01, 2005
Statement [line items]        
Contribution expense to the plan $ 80,000 $ 68,000 $ 47,000  
Percentage of wages contribution to employee       6.00%
Plan assets 4,500,000      
Present value of the defined benefit obligations (3,000,000)      
Salary 115,626,000 125,813,000 142,564,000  
Labour and social welfare 2,588,000 2,390,000 2,088,000  
Defined contribution plans        
Statement [line items]        
Contribution expense to the plan 3,864,000 3,922,000 3,828,000  
Other Foreign Subsidiaries Pension Expenses $ 221,000 $ 221,000 $ 564,000