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Marketable Securities (Schedule of investment income) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Marketable Securities: [Abstract]
Gain on sale of marketable securities		$ 5us-gaap_MarketableSecuritiesGainLoss	$ 386us-gaap_MarketableSecuritiesGainLoss	$ 182,846us-gaap_MarketableSecuritiesGainLoss
Interest income	662us-gaap_InvestmentIncomeInterest	343us-gaap_InvestmentIncomeInterest	1,287us-gaap_InvestmentIncomeInterest	1,296us-gaap_InvestmentIncomeInterest
Dividend income	25,691us-gaap_InvestmentIncomeDividend	30,617us-gaap_InvestmentIncomeDividend	30,871us-gaap_InvestmentIncomeDividend	36,247us-gaap_InvestmentIncomeDividend
Total	$ 26,353us-gaap_InvestmentIncomeNet	$ 30,965us-gaap_InvestmentIncomeNet	$ 32,544us-gaap_InvestmentIncomeNet	$ 220,389us-gaap_InvestmentIncomeNet

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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