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Employee benefits (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Employee benefits    
Present value of the defined benefit obligations $ 3,562 $ 3,142
Fair value of plan assets (3,952) (3,730)
Surplus (deficit) in plan (390) (588)
Net defined benefit liabilities 47 50
Prepaid pension cost (437) (638)
Aggregate Reconciliations of defined benefit obligation $ (390) $ (588)