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Other income and other net gains/(losses) (Tables) | 12 Months Ended
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Dec. 31, 2022
Other income and other net gain/(losses) |
Schedule of other income and other net gains/(losses) |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  | $ |  |  | $ |  |  | $ |
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)/gain s |  |  | (688,725 | ) |  |  | 285,025 |  |  |  | (280,360 | )
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 |
|  |  | 404,643 |  |  |  | 138,948 |  |  |  | (315,404 | )

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