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Investment in associate company - Company's share of profit of associate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]      
Share of profit in associated companies $ 858 $ 802 $ 649
Other comprehensive income for the year, net of tax (53) 193  
Total comprehensive income for the year $ 805 $ 995