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Related party transactions (Details) - USD ($)
Sep. 30, 2021
Sep. 30, 2020
Related Party Transaction [Line Items]    
Due to related parties $ 57,632 $ 1,714,811
Yefang Zhang    
Related Party Transaction [Line Items]    
Due to related parties 0 1,714,811
FarmNet Limited    
Related Party Transaction [Line Items]    
Due to related parties 54,600 0
Zhejiang Tantech Bamboo Technology Co., Ltd.    
Related Party Transaction [Line Items]    
Due to related parties $ 3,032 $ 0