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Accounting Records and Use of Estimates (Narrative) (Details) - USD ($)
 3 Months Ended
Oct. 31, 2016
Jul. 31, 2016
Jul. 31, 2015
Operating Loss Carryforwards [Line Items]      
Period over which state capital-based tax will be phased out 7 years    
Domestic Tax Authority [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards   $ 6,576,000 $ 6,609,000
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards   $ 8,943,000 $ 9,000,000