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Other income and other net gains/(losses) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other income and other net gain/(losses)      
Government subsidies (note) $ 534,678 $ 7,932 $ 513,860
Bank interest income 472,189 3,980 8,043
Dividend income 9,862    
Net foreign exchange (losses)/gains (688,725)   (280,360)
Net foreign exchange (losses)/gains   285,025  
Impairment loss on interest in a joint venture     (570,704)
Impairment loss on amount due from a joint venture   (176,227)  
Sundry income 76,639 18,238 13,757
Other income and other net gain/(losses) $ 404,643 $ 138,948 $ (315,404)