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Consolidated Income Statements - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Sales of goods / services $ 425,215 $ 384,565 $ 389,632
Cost of sales (385,527) (352,957) (366,143)
Gross profit 39,688 31,608 23,489
Other operating income 5,084 5,441 1,140
Selling, general and administrative expenses (27,248) (26,325) (27,007)
Other operating expenses (909) (3,386) (332)
Operating profit/(loss) 16,615 7,338 (2,710)
Finance costs (1,221) (1,147) (1,547)
Finance income 876 1,045 697
Share of loss of associates (3) (710) (801)
Impairment of investment in associates   (126)  
Loss on liquidation of subsidiary (261)    
Exchange gain / (loss) 2,784 (38) (4,223)
Other income 214 267 119
Other expense (336) (94) (180)
Profit/(loss) before tax 18,668 6,535 (8,645)
Income tax expense (5,140) (510) (466)
Profit/(loss) for the year 13,528 6,025 (9,111)
Attributable to:      
Equity holders of the parent 8,720 2,853 (7,694)
Non-controlling interests 4,808 3,172 (1,417)
Profit/(loss) for the year $ 13,528 $ 6,025 $ (9,111)
Earnings/(loss) per share      
Basic and diluted profit/(loss) for the year attributable to equity holders of the parent $ 0.63 $ 0.21 $ (0.56)