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Income Taxes - Reconciliation of Income Tax Expense to Federal Statutory Rate (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of reconciliation of income tax expense
Income tax computed at statutory rate	$ 17,628,078us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 12,471,258us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 9,128,915us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
City and state income taxes, net of federal benefit	887,093us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	794,220us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	344,187us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other	269,834us-gaap_IncomeTaxReconciliationOtherAdjustments	211,859us-gaap_IncomeTaxReconciliationOtherAdjustments	(321,379)us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes	$ 18,785,005us-gaap_IncomeTaxExpenseBenefit	$ 13,477,337us-gaap_IncomeTaxExpenseBenefit	$ 9,151,723us-gaap_IncomeTaxExpenseBenefit

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Number 210

-Section 08

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=6515339



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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.

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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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