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Summary of significant accounting policies (Details) - Nongyuan Network (VIE) - USD ($)
Sep. 30, 2018
Sep. 30, 2017
Variable Interest Entity [Line Items]    
Current assets $ 481,228 $ 281,493
Plant and equipment, net 71,239 37,479
Total assets 552,467 318,972
Total liabilities (272,715) (26,015)
Net assets $ 279,752 $ 292,957