Annual report pursuant to Section 13 and 15(d)

Short -Term Investments and Marketable Securities - Additional Information (Detail)

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Short -Term Investments and Marketable Securities - Additional Information (Detail) (USD $)
12 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2010
Schedule Of Short Term Investments And Available For Sale Securities [Line Items]      
Market value $ 2,283,772 $ 5,345,022  
Gross unrealized gains 76,119 188,265  
Gross unrealized losses (20,256) (380,335)  
Available-for-sale securities liquidated and proceeds 4,430,892 3,516,000 17,619,057
(Gain) Loss on sale of securities 121,670 815 (10,481)
Unrealized gains on investments 55,863    
Deferred tax benefit 20,616 77,594  
Deferred tax expense $ 98,210