Summary of Significant Accounting Policies (Details Textuals 1) - customer	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Concentration risk, benchmark description	more than 10	more than 10	more than 10
Concentration risk, customer	No single customer accounted for more than 10	no single customer accounted for more than 10	no single customer accounted for more than 10
Number of Customers Exceeding Threshold	0	0	0
Accounts receivables
Revenue, Major Customer [Line Items]
Concentration risk, benchmark description	more than 10	more than 10
Concentration risk, customer	no customer accounted for more than 10%
Number of Customers Exceeding Threshold	0	0