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Income Taxes - Reconciliation of Income Tax Expense to Federal Statutory Rate (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of reconciliation of income tax expense      
Income tax computed at statutory rate $ 10,945,831 $ 16,472,987 $ 13,646,583
Expense (benefit) attributable to redeemable noncontrolling interests 104,035 (1,007,012) 222,624
State and local income taxes, net of federal benefit 1,875,882 2,835,215 2,993,730
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 632,705 625,009 400,060
Change in uncertain state and local tax positions, net of federal benefit 0 (47,197) 2,982,337
Revaluation adjustment of net deferred tax assets 0 0 (917,288)
Excess tax deficit (benefit) on vesting of restricted stock 612,930 (70,878) (667,697)
Income tax benefit from dividends paid on restricted stock (455,283) (431,192) (340,200)
Interest and penalties 1,460 101,010 786,711
Other 240,308 210,532 (437,519)
Provision for income taxes $ 13,957,868 $ 18,688,474 $ 18,669,341