Other receivables, net - Movements of allowance for credit losses (Details) - USD ($) |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Jun. 30, 2025 |
|
| Movements of allowance for credit losses | |||
| Beginning balance | $ 403,403 | $ 2,972,289 | $ 2,972,289 |
| Addition | 10,500 | 3,375 | 13,875 |
| Write-off | 0 | $ 0 | (2,582,761) |
| Ending balance | $ 413,903 | $ 403,403 | |