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(6) Redeemable Preferred Stock (Detail) (USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Equity [Abstract]    
Temporary equity, redemption price per share (in dollars per share) $ 1.00 $ 1.00
Temporary equity, accretion of interest $ 563,535 $ 566,262