Income Taxes - Schedule of tax effects of temporary differences and carryforwards of the TRSs included in net deferred tax assets (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 27,196,000	$ 22,338,000
Property, primarily differences in depreciation and amortization, the tax basis of land assets and treatment of certain other costs	2,927,000	6,784,000
Other	644,000	1,635,000
Deferred tax assets	30,767,000	30,757,000
Unrecognized tax benefits	$ 0	$ 0	$ 0