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Related party transactions (Details) - USD ($)
Mar. 31, 2022
Sep. 30, 2021
Related Party Transaction [Line Items]    
Due to related parties   $ 57,632
Due from related parties $ 337,746  
Yefang Zhang    
Related Party Transaction [Line Items]    
Due from related parties 319,467  
FarmNet Limited    
Related Party Transaction [Line Items]    
Due to related parties   54,600
Due from related parties 18,200  
Zhejiang Tantech Bamboo Technology Co., Ltd.    
Related Party Transaction [Line Items]    
Due to related parties   $ 3,032
Xinyang Wang    
Related Party Transaction [Line Items]    
Due from related parties $ 79