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Property, plant and equipment, net (Details) - USD ($)
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]    
Subtotal $ 324,121 $ 278,975
Accumulated depreciation and amortization (187,758) (176,459)
Total 136,363 102,516
Office equipment    
Property, Plant and Equipment [Line Items]    
Subtotal 39,755 46,214
Vehicles    
Property, Plant and Equipment [Line Items]    
Subtotal 68,307 17,976
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Subtotal 98,414 93,337
Leasehold improvement    
Property, Plant and Equipment [Line Items]    
Subtotal $ 117,645 $ 121,448