Financial instruments - Narratives (Details) - HKD ($) |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of financial assets [line items] | ||
| Current trade receivables | $ 166,068 | $ 0 |
| Bank deposits | 561,152,523 | 247,297,181 |
| Measured For Credit Loss | ||
| Disclosure of financial assets [line items] | ||
| Current trade receivables | 166,068 | 0 |
| Deposits and other receivables | 4,063,825 | 1,945,968 |
| Receivables due from related parties | 335,763 | 138,171 |
| Bank deposits | 622,183,633 | 629,407,636 |
| Hong Kong, Dollars | Measured For Credit Loss | ||
| Disclosure of financial assets [line items] | ||
| Bank balances and deposits | 618,939,689 | 627,312,592 |
| China, Yuan Renminbi | Measured For Credit Loss | ||
| Disclosure of financial assets [line items] | ||
| Bank balances and deposits | $ 2,527,104 | $ 891,261 |