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Cash Flow Information (Schedule of cash flow information) (Details) (USD $)
9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Cash Flow Information: [Abstract]    
Interest paid, net of capitalized interest of $6,367 (2015) and $11,100 (2014) $ 280,522us-gaap_InterestPaid $ 326,817us-gaap_InterestPaid
Income taxes paid (refunded) 387,163us-gaap_IncomeTaxesPaid (14,417)us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities:    
Refinancing of mortgage payable $ 5,347,726us-gaap_TransferMortgagePayable