Income Tax Provision - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Provision [Line Items]
Income tax expense		$ 6,019,146	$ 4,959,000
Effective corporate income tax rate		35.00%
Net deferred income tax benefit remeasurement		$ 15,000
Valuation allowance reversed			405,000
Accrued interest or penalties		$ 0	$ 0
Minimum [Member]
Income Tax Provision [Line Items]
Partnership tax returns subjected to examination		2014
Maximum [Member]
Income Tax Provision [Line Items]
Partnership tax returns subjected to examination		2016
Scenario, Forecast [Member]
Income Tax Provision [Line Items]
Effective corporate income tax rate	21.00%
Greens Hold Co [Member]
Income Tax Provision [Line Items]
Income tax expense				$ 0