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Derivative Financial Instruments, Gain (Loss) by Income Statement Location (Details) (Cash Flow Hedging [Member], Interest Rate Swap [Member], USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized losses	$ 0	$ (305,459)	$ (1,128,758)
Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains	$ 0	$ 319,235	$ 1,017,032

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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