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Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 19,940,946	$ 22,221,759	$ 16,768,294
Other comprehensive income, net of tax
Reclassification adjustment for loss on interest rate swap agreements, net of tax of $110,452 for 2011			178,090
Comprehensive income	$ 19,940,946	$ 22,221,759	$ 16,946,384

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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