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Contractual Maturities of Debt Securities (Detail) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Due in 1 year or less $ 11,907,564  
Due in 1 to 2 years 12,417,457  
Amortized Cost 24,325,021 24,850,448
Due in 1 year or less 11,918,020  
Due in 1 to 2 years 12,417,051  
Fair Value $ 24,335,071 $ 24,856,786