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Summary of significant accounting policies (Details Narrative)
 12 Months Ended
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