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Marketable Securities (Schedule of investment income) (Details) (USD $)
3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Marketable Securities: [Abstract]    
Gain on sale of marketable securities $ 386 $ 182,841
Interest income 625 953
Dividend income 5,180 5,630
Total $ 6,191 $ 189,424