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Employee benefits (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Balance at beginning of year $ 3,410 $ 2,992
Interest income 57 48
Remeasurements loss (gain):    
-Return on plan assets excluding interest income 81 (21)
Contributions paid by the employer 132 132
Effect of changes in exchange rate (115) 259
Balance at end of year $ 3,565 $ 3,410