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Marketable Securities (Schedule of financial assets measured at fair value on recurring basis) (Details) (USD $)
Apr. 30, 2015
Jul. 31, 2014
Marketable securities -    
Available-for-sale $ 1,477,072us-gaap_AvailableForSaleSecurities $ 1,354,213us-gaap_AvailableForSaleSecurities
Level 1 [Member]    
Marketable securities -    
Available-for-sale 1,477,072us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 1,354,213us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 2 [Member]    
Marketable securities -    
Available-for-sale      
Level 3 [Member]    
Marketable securities -    
Available-for-sale