Annual report pursuant to Section 13 and 15(d)

Other Income - Summary of Other Income (Detail)

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Other Income - Summary of Other Income (Detail) (USD $)
12 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2010
Other Items Net Interest And Other Financial Income [Line Items]      
Interest income $ 112,490 $ 145,719 $ 137,545
Dividend income 87,743 110,337 136,756
Realized gain (loss) on sale of securities 121,670 815 (10,481)
Royalty income 216,890 208,981 157,850
Miscellaneous 67,860 12,670 44,759
Total other income $ 606,653 $ 478,522 $ 466,429