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Trade and other payables - Movement of dividends payable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Trade and other payables      
Beginning balance $ 567 $ 638 $ 604
Declared dividends to controlling shareholders, note 17(d) 18,542 0 0
Dividends paid to controlling shareholders, note 17(d) (18,542) 0 0
Declared dividends to non-controlling shareholders, note 17(d) 2,647 6,160 5,140
Dividends paid to non-controlling shareholders, note 17(d) (2,647) (6,160) (5,140)
Expired dividends, note 17(c) 0 (76) (26)
Other 72 5 60
Ending balance $ 639 $ 567 $ 638