Summary of significant accounting policies - Other receivables, net (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Summary of significant accounting policies | |||
| Credit loss on other receivable | $ 603,839 | $ 13,875 | $ 389,528 |
| Other receivable charged against the allowance | $ 728,549 | $ 2,582,761 | $ 0 |