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Related party transactions (Details) - USD ($)
Sep. 30, 2018
Sep. 30, 2017
Related Party Transaction [Line Items]    
Total $ 122,800 $ 415,381
Yefang Zhang    
Related Party Transaction [Line Items]    
Total 0 415,381
FarmNet Limited    
Related Party Transaction [Line Items]    
Total $ 122,800 $ 0