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Advances to suppliers (Detail Textuals)
12 Months Ended
Sep. 30, 2018
USD ($)
Supplier
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Share-based Goods and Nonemployee Services Transaction [Line Items]      
Advances to suppliers $ 5,868,486 $ 4,112,915 $ 3,716,616
Number of suppliers | Supplier 2    
Two suppliers      
Share-based Goods and Nonemployee Services Transaction [Line Items]      
Advances to suppliers $ 5,594,423    
Percentage of advances to suppliers utilized 85.00%    
Percentage of advances to suppliers on each purchase order 30.00%