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Marketable Securities (Schedule of investment income) (Details) (USD $)
3 Months Ended 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Marketable Securities: [Abstract]        
Gain on sale of marketable securities $ 6,069us-gaap_MarketableSecuritiesGainLoss    $ 6,455us-gaap_MarketableSecuritiesGainLoss $ 182,846us-gaap_MarketableSecuritiesGainLoss
Interest income 860us-gaap_InvestmentIncomeInterest 529us-gaap_InvestmentIncomeInterest 2,147us-gaap_InvestmentIncomeInterest 1,825us-gaap_InvestmentIncomeInterest
Dividend income 6,596us-gaap_InvestmentIncomeDividend 6,162us-gaap_InvestmentIncomeDividend 37,467us-gaap_InvestmentIncomeDividend 42,409us-gaap_InvestmentIncomeDividend
Total $ 13,525us-gaap_InvestmentIncomeNet $ 6,691us-gaap_InvestmentIncomeNet $ 46,069us-gaap_InvestmentIncomeNet $ 227,080us-gaap_InvestmentIncomeNet