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Income tax expense/(credit) - Taxation in the consolidated statements of profit or loss represents (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax      
Origination and reversal of temporary differences $ (279,633) $ 2,530,047 $ (1,957,229)
Tax expense/(credit) 7,147,104 3,732,744 (1,937,558)
Hong Kong      
Current tax expense - Overseas      
Provision for the year 7,338,274 1,164,222  
Deferred tax      
Tax expense/(credit)     0
Overseas      
Current tax expense - Overseas      
Provision for the year $ 88,463 $ 38,475 $ 19,671