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Income Taxes - Reconciliation of Income Tax Expense to Federal Statutory Rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of reconciliation of income tax expense
Income tax computed at statutory rate	$ 16,472,987	$ 13,646,583	$ 28,356,636
Expense (benefit) attributable to redeemable noncontrolling interests	(1,007,012)	222,624	(564,449)
State and local income taxes, net of federal benefit	2,835,215	2,993,730	1,153,357
Change in uncertain state and local tax positions, net of federal benefit	(47,197)	2,982,337	0
Revaluation adjustment of net deferred tax assets	0	(917,288)	3,557,039
Excess tax benefits on vesting of Restricted Stock	(70,878)	(667,697)	(2,420,250)
Income tax benefit from dividends paid on Restricted Stock	(431,192)	(340,200)	(418,583)
Interest and Penalties	101,010	786,711	0
Other	835,541	(37,459)	(246,460)
Provision for income taxes	$ 18,688,474	$ 18,669,341	$ 29,417,290

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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