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Income tax expense - Reconciliation of tax (Details) - HKD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Comprehensive income, continuing and discontinued operations [abstract] |  |
Profit before tax | $ 5,804,192 | $ 4,472,893
Tax at the domestic rate of 16.5% (Note) | 957,692 | 738,027
Tax effect of income not taxable for tax purposes | (4,577,504) | (5,178,539)
Tax effect of expenses not deductible for tax purposes | 208,014 | 843,431
Tax effect of deductible temporary differences not recognized | 197,756 | 275,759
Tax effect of tax losses not recognized | 4,274,704 | 4,425,036
Effect of different tax rates of subsidiaries operating in other jurisdictions | (1,060,662) | (1,103,714)
Income tax expense for the year | $ 0 | $ 0
HONG KONG |  |
Income Tax Disclosure [Line Items] |  |
Applicable tax rate (%) | 16.50% |

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