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Trade and other payables - Movement of dividends payable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trade and other payables      
Beginning balance $ 604 $ 663 $ 730
Declared dividends to controlling shareholders, note 17(d)   22,098 22,860
Dividends paid to controlling shareholders   (22,098) (22,860)
Declared dividends to non-controlling shareholders, note 17(d) 5,140 6,500 5,560
Dividends paid to non-controlling shareholders, note 17(d) (5,140) (6,500) (5,560)
Expired dividends (26) (53) (44)
Other minor 60 (6) (23)
Final balance $ 638 $ 604 $ 663