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Revenue, Other Income And Other Gain - Schedule of other income (Detail) - HKD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Other Operating Income [Line Items] |  |  |
Bank interest income | $ 12,332 | $ 15,174 | $ 67,783
Other interest income | 51,304,121 |  |
Interest income from the immediate holding company (Note 29(A)(iv)) (Note 29(B)(i)) | 75,991,943 | 116,028,045 | 101,159,079
Government grant (note b) | 1,184,000 |  | 3,061,665
Others | 12,969,150 | 9,494,952 | 7,578,941
Total other income | $ 141,461,546 | $ 125,538,171 | $ 111,867,468

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