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Aggregate Fair Value, Contractual Balance (Including Accrued Interest), and Gain or Loss (Detail) (USD $)
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Fair Value Disclosures [Line Items]    
Aggregate fair value $ 25,062,786 $ 9,392,389
Contractual balance 24,324,044 9,210,425
Gain (loss) $ 738,742 $ 181,964