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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, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Provision for income taxes at Federal statutory rate									$ 9,980,855	$ 11,370,154	$ 12,651,896
Increase resulting from:
State income taxes, net of Federal benefit									1,059,249	1,143,692	1,244,834
Non-deductible transaction costs									733,689
Other									39,585	31,363	29,786
Income tax expense	$ 2,528,895	$ 2,833,019	$ 2,886,484	$ 3,564,980	$ 3,046,179	$ 2,878,811	$ 3,238,458	$ 3,381,761	$ 11,813,378	$ 12,545,209	$ 13,926,516

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).

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