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Accounts receivable (Details) - USD ($)
Sep. 30, 2018
Sep. 30, 2017
Accounts Receivable, Net [Abstract]    
Accounts receivable - trade $ 8,601,269 $ 5,050,951
Accounts receivable - related party 1,257 93,506
Accounts receivable, net $ 8,602,526 $ 5,144,457