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Income Taxes - Reconciliation of Income Tax Expense to Federal Statutory Rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of reconciliation of income tax expense
Income tax computed at statutory rate	$ 25,641,618	$ 20,294,107	$ 17,628,078
City and state income taxes, net of federal benefit	1,276,777	1,027,768	887,093
Other	(250,760)	(413,210)	269,834
Provision for income taxes	$ 26,667,635	$ 20,908,665	$ 18,785,005

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 740
-SubTopic 10
-Section 50
-Paragraph 9
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

+ References

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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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