Income Taxes - Summary of Deferred Income Tax Assets (Liabilities) (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Deferred Income Tax Assets
Depreciation	$ 2,833,613	$ 2,541,509
Intangible Lease Liabilities	12,336,115
Deferred Revenue on Land Sales	4,524,189
Deferred Oil Lease Income	405,313	545,179
Deferred Lease Expense	1,003,967	1,147,181
Pension and Other Post Retirement Benefits		55,083
Stock Options	1,020,855	621,489
Unrealized Loss on Investment Securities	432,677
Impairment Reserves	1,688,979	1,688,979
Other - Net	381,897	80,501
Gross Deferred Income Tax Assets	24,627,605	6,679,921
Less - Valuation Allowance	(415,453)	(415,453)
Net Deferred Income Tax Assets	24,212,152	6,264,468
Deferred Income Tax Liabilities
Sales of Real Estate	(62,067,529)	(39,635,433)
Discount on Equity Component of Convertible Debt	(1,150,507)
Basis Difference in Joint Venture	(342,015)	(342,015)
Other - Net	(178,507)	(325,462)
Total Deferred Income Tax Liabilities	(63,738,558)	(40,302,910)
Net Deferred Income Tax Liabilities	$ (39,526,406)	$ (34,038,442)