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Related Party Transactions (Details Textuals) - Executive Officer - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2016
Jul. 31, 2018
Jul. 31, 2017
Related Party Transactions, By Related Party [Abstract]      
Related party property purchased amount $ 2,000    
Related Party Transaction, Due from (to) Related Party   $ 0 $ 0