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Short-Term Investments and Marketable Securities - Cost and Market Values of Investments (Details) (USD $)
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Nov. 30, 2013
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Sep. 27, 2013
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Nov. 30, 2013
Limited Partnerships [Member]
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Oct. 27, 2010
Limited Partnerships [Member]
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Nov. 30, 2013
Energy Transfer Partners [Member]
Limited Partnerships [Member]
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Oct. 27, 2010
Energy Transfer Partners [Member]
Limited Partnerships [Member]
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Nov. 30, 2013
Enterprise Products Partners L P [Member]
Limited Partnerships [Member]
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Oct. 27, 2010
Enterprise Products Partners L P [Member]
Limited Partnerships [Member]
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Nov. 30, 2013
Kinder Morgan Energy [Member]
Limited Partnerships [Member]
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Oct. 27, 2010
Kinder Morgan Energy [Member]
Limited Partnerships [Member]
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Nov. 30, 2013
Magellan Midstream Partners [Member]
Limited Partnerships [Member]
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Oct. 27, 2010
Magellan Midstream Partners [Member]
Limited Partnerships [Member]
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Nov. 30, 2013
Plains All American Pipeline Limited Partner [Member]
Limited Partnerships [Member]
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Oct. 27, 2010
Plains All American Pipeline Limited Partner [Member]
Limited Partnerships [Member]
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Nov. 30, 2013
Standard And Poors Five Hundred Exchange Traded Funds Trust [Member]
Common Stock
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Sep. 27, 2013
Standard And Poors Five Hundred Exchange Traded Funds Trust [Member]
Common Stock
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| Schedule Of Investments In Marketable Securities [Line Items] | ||||||||||||||||
| Number of Units-Principal Amount of Bonds and Notes (shares) | 1,000 | 500 | 500 | 1,000 | 1,000 | 4,190 | ||||||||||
| Cost of Each Issue | $ 823,419 | $ 223,373 | $ 50,695 | $ 21,190 | $ 34,762 | $ 53,113 | $ 63,613 | $ 600,046 | ||||||||
| Market Value of Each Issue at Balance Sheet Date | $ 1,112,440 | $ 354,050 | $ 54,160 | $ 31,485 | $ 40,985 | $ 124,280 | $ 103,140 | $ 758,390 |