Property, Buildings and Equipment - Schedule of Property, Buildings and Equipment (Detail) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, buildings and equipment	$ 62,533,445	$ 62,009,223
Less accumulated depreciation	(45,552,014)	(44,477,547)
Property, buildings and equipment, net	16,981,431	17,531,676
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, buildings and equipment	8,740,994	8,740,994
Buildings and Recreational Facilities [Member]
Property, Plant and Equipment [Line Items]
Property, buildings and equipment	31,964,694	31,962,963
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, buildings and equipment	21,626,258	21,178,583
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, buildings and equipment	$ 201,499	$ 126,683