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Consolidated Income Statements - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Revenue $ 338,160 $ 425,940 $ 425,215
Cost of sales (313,373) (389,692) (385,527)
Gross profit 24,787 36,248 39,688
Other operating income 385 805 5,084
Selling, general and administrative expenses (25,051) (26,924) (27,248)
Other operating expenses (770) (1,445) (909)
Operating (loss) /profit (649) 8,684 16,615
Finance costs (1,012) (1,378) (1,221)
Finance income 506 482 876
Share of loss of associates (3) (3) (3)
Loss on liquidation of a subsidiary     (261)
Exchange gain 1,550 1,741 2,784
Other income 717 1,817 214
Other expense (3) (11) (336)
Profit before tax 1,106 11,332 18,668
Income tax expense (2,057) (3,886) (5,140)
(Loss) /Profit for the year (951) 7,446 13,528
Attributable to:      
Equity holders of the parent (1,632) 2,928 8,720
Non-controlling interests 681 4,518 4,808
(Loss) /Profit for the year $ (951) $ 7,446 $ 13,528
(Loss) /earnings per share      
Basic and diluted (loss)/profit for the year attributable to equity holders of the parent $ (0.12) $ 0.21 $ 0.63