Annual report pursuant to Section 13 and 15(d)

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

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Short-Term Investments and Marketable Securities - Schedule of Cost and Market Values of Investments (Detail) (USD $)
Nov. 30, 2012
Nov. 30, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Short-term investments and marketable securities at cost $ 2,227,909 $ 2,377,987
Short-term investments and marketable securities 2,283,772 2,361,996
Marketable Securities Non-current Cost    3,159,099
Marketable securities    2,983,026
Current and non-current cost 2,227,909 5,537,086
Current and non-current market value 2,283,772 5,345,022
Corporate Obligations [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Short-term investments and marketable securities at cost 1,004,490 970,461
Short-term investments and marketable securities 995,827 964,357
Marketable Securities Non-current Cost    754,518
Marketable securities    734,418
Limited Partnerships [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Short-term investments and marketable securities at cost 223,373 223,373
Short-term investments and marketable securities 292,680 234,445
Preferred Stocks [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Short-term investments and marketable securities at cost    454,855
Short-term investments and marketable securities    382,340
Marketable Securities Non-current Cost    2,404,581
Marketable securities    2,248,608
Common Stock [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Short-term investments and marketable securities at cost 600,046 443,818
Short-term investments and marketable securities 595,626 557,827
Mutual Funds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Short-term investments and marketable securities at cost    285,480
Short-term investments and marketable securities    223,027
Fixed Income [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Short-term investments and marketable securities at cost 400,000   
Short-term investments and marketable securities $ 399,639