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Income Taxes - Provision for income taxes reflects an effective U.S tax rate, which differs from the corporate tax rate (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Tax Disclosure [Abstract]
Provision for income taxes at Federal statutory rate									$ 11,370,154	$ 12,651,896	$ 9,550,462
Increase resulting from:
State income taxes, net of Federal benefit									1,143,692	1,244,834	966,543
Other									31,363	29,786	1,735
Income tax expense	$ 3,046,179	$ 2,878,811	$ 3,238,458	$ 3,381,761	$ 3,749,890	$ 3,340,762	$ 3,504,456	$ 3,331,408	$ 12,545,209	$ 13,926,516	$ 10,518,740

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

+ References+ Details