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Trade and other payables (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Trade and other payables [Abstract]      
Beginning balance $ 730 $ 1,018 $ 1,044
Declared dividends to controlling shareholders, note 17(d) 22,860 22,099 7,621
Dividends paid to controlling shareholders (22,860) (22,099) (7,621)
Declared dividends to non-controlling shareholders 5,560 6,036 7,400
Dividends paid to non-controlling shareholders (5,560) (6,036) (7,400)
Expired dividends (44) (327) (30)
Other minor (23) 39 4
Final balance $ 663 $ 730 $ 1,018