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Summary of significant accounting policies (Details Narrative) | 12 Months Ended |  |  |
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Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2019 USD ($) | Apr. 30, 2014 USD ($) | Jan. 31, 2014 USD ($)
Summary of significant accounting policies |  |  |  |  |  |
Working capital | $ 60,000,000.0 |  |  |  |  |
Net assets and shareholders' surplus | $ 96,900,000 |  |  |  |  |
Description of biological assets | Biological assets mainly consist forest for future wood harvest and sales, of which the Company owned 27 forest right certificates with expiry dates ranging from August 2053 to December 2076 and with an aggregate area of 14.5 square miles. Biological assets are initially measured at cost and subsequently depreciated on a straight-line basis over its estimated useful lives, ranging from 30 to 54 years depending on the expiry dates of those 27 forest right certificates |  |  |  |  |
Estimated useful life of land use right |  |  | 50 years |  |  |
Shipping and handling expenses | $ 0 | $ 24,979 | $ 65,881 |  |  |
Government subsidy income | 81,896 | 97,366 | $ 132,211 |  |  |
Government subsidies received, equipment of energy projects |  |  |  | $ 140,000 | $ 140,000 | $ 840,000
Unrecognized government grants | $ 0 | $ 202,165 |  |  |  |
Maximum rate of VAT | 13.00% |  |  |  |  |
Effect of exchange rate on foreign currency translation | 7.0176 | 7.2960 |  |  |  |
Average exchange rates | 7.2043 | 7.0533 | 6.5728 |  |  |
Net cash used in operating activities | $ 2,400,000 |  |  |  |  |
Maximum insured amount deposit in bank | $ 71,249 |  |  |  |  |

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