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Interest Rate Swap Agreements - Summary of locations and amounts of gains (losses) recognized in income (Details 1) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Periodic change in fair value of interest rate swaps	$ (504,852)		$ 783,678
Losses reclassified from accumulated other comprehensive loss			(288,542)
Total	(504,852)		495,136
Periodic settlement differentials included in interest expense	(277,364)		(801,048)
Loss recognized in income	$ (782,216)		$ (305,912)

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The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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