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Employee benefits (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 01, 2005
Labour And Social Welfare $ 1,655 $ 1,523  
Wages and salaries 91,822 89,911  
Percentage Of Wages Contribution To Employee     6.00%
Post-employment benefit expense, defined contribution plans 123    
Deposits from banks $ 3,565    
Percentage of Company Contributes Towards Wages and Salaries 2.00%    
Defined Contribution Plans [Member]      
Other Foreign Subsidiaries Pension Expenses $ 253 178  
Wages and salaries $ 3,527 $ 3,367  
Bottom of range [member]      
Weighted average duration of defined benefit obligation 20    
Top of range [member]      
Weighted average duration of defined benefit obligation 21