Annual report pursuant to Section 13 and 15(d)

Short-Term Investments and Marketable Securities - Cost and Market Values of Investments (Detail)

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Short-Term Investments and Marketable Securities - Cost and Market Values of Investments (Detail) (USD $)
 12 Months Ended
Nov. 30, 2012
Schedule Of Investments In Marketable Securities [Line Items]  
Cost of Each Issue $ 2,227,909
Market Value of Each Issue at Balance Sheet Date 2,283,772
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 2,283,772
Corporate Obligations [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Cost of Each Issue 1,004,490
Market Value of Each Issue at Balance Sheet Date 995,827
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 995,827
Corporate Obligations [Member] | Barclays Bank [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Maturity Date Oct. 07, 2013
Interest Rate 1.15%
Number of Units-Principal Amount of Bonds and Notes 500,000
Cost of Each Issue 500,000
Market Value of Each Issue at Balance Sheet Date 493,375
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 493,375
Corporate Obligations [Member] | America Express Credit Corp [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Maturity Date Dec. 15, 2012
Interest Rate 3.90%
Number of Units-Principal Amount of Bonds and Notes 200,000
Cost of Each Issue 250,000
Market Value of Each Issue at Balance Sheet Date 250,007
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 250,007
Corporate Obligations [Member] | JP Morgan Chase Series [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Maturity Date Sep. 30, 2013
Interest Rate 1.65%
Number of Units-Principal Amount of Bonds and Notes 250,000
Cost of Each Issue 254,490
Market Value of Each Issue at Balance Sheet Date 252,445
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 252,445
Limited Partnerships [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Cost of Each Issue 223,373
Market Value of Each Issue at Balance Sheet Date 292,680
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 292,680
Limited Partnerships [Member] | Energy Transfer Partners [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Number of Units-Principal Amount of Bonds and Notes 1,000
Cost of Each Issue 50,695
Market Value of Each Issue at Balance Sheet Date 43,890
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 43,890
Limited Partnerships [Member] | Enterprise Prods Partners [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Number of Units-Principal Amount of Bonds and Notes 500
Cost of Each Issue 21,190
Market Value of Each Issue at Balance Sheet Date 25,915
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 25,915
Limited Partnerships [Member] | Kinder Morgan Energy [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Number of Units-Principal Amount of Bonds and Notes 500
Cost of Each Issue 34,762
Market Value of Each Issue at Balance Sheet Date 40,755
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 40,755
Limited Partnerships [Member] | Magellan Midstream Partners [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Number of Units-Principal Amount of Bonds and Notes 1,000
Cost of Each Issue 53,113
Market Value of Each Issue at Balance Sheet Date 88,960
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 88,960
Limited Partnerships [Member] | Plains All Amem Pipeline [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Number of Units-Principal Amount of Bonds and Notes 1,000
Cost of Each Issue 63,613
Market Value of Each Issue at Balance Sheet Date 93,160
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 93,160
Common Stock [Member] | S&P 500 ETF Trust [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Number of Units-Principal Amount of Bonds and Notes 4,190
Cost of Each Issue 600,046
Market Value of Each Issue at Balance Sheet Date 595,626
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 595,626
Fixed Income [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Cost of Each Issue 400,000
Market Value of Each Issue at Balance Sheet Date 399,639
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 399,639
Fixed Income [Member] | Homebanc Natl Assn [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Maturity Date Jan. 30, 2013
Interest Rate 0.20%
Number of Units-Principal Amount of Bonds and Notes 150
Cost of Each Issue 150,000
Market Value of Each Issue at Balance Sheet Date 149,954
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet 149,954
Fixed Income [Member] | Safra Natl Bank CD [Member]
  
Schedule Of Investments In Marketable Securities [Line Items]  
Maturity Date Nov. 14, 2013
Interest Rate 0.45%
Number of Units-Principal Amount of Bonds and Notes 250
Cost of Each Issue 250,000
Market Value of Each Issue at Balance Sheet Date 249,685
Amount at Which Each Portfolio of Equity Security Issue and Each Other Security Issue Carried in Balance Sheet $ 249,685