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Income Taxes - Reconciliation of Income Tax Expense to Federal Statutory Rate (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of reconciliation of income tax expense      
Income tax computed at statutory rate $ 20,294,107 $ 17,628,078 $ 12,471,258
City and state income taxes, net of federal benefit 1,027,768 887,093 794,220
Other (413,210) 269,834 211,859
Provision for income taxes $ 20,908,665 $ 18,785,005 $ 13,477,337