Summary of significant accounting policies (Details 1) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2023 |
|
| Summary of significant accounting policies | |||
| Value-added tax refund | $ 0 | $ 0 | $ 465,072 |
| Investment grant | 0 | 0 | 292,487 |
| Equipment of energy projects grants | 0 | 81,896 | 97,366 |
| Research and development grants | 0 | 0 | 71,058 |
| Total | $ 0 | $ 81,896 | $ 925,983 |