BUSINESS SEGMENT DATA - Summary of Operations in Different Segments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business segment data
Total Revenues	$ 12,380,602	$ 12,210,945	$ 73,931,669	$ 43,439,318
Operating Income (Loss)	3,757,449	15,879,509	34,647,267	27,005,693
Depreciation and Amortization	3,161,169	1,945,460	9,139,434	5,818,386
Identifiable Assets	436,710,801		436,710,801		$ 408,623,426
Operating Segments
Business segment data
Capital Expenditures	3,077,685	49,758,942	49,689,557	52,640,944
General and Corporate Expense
Business segment data
Operating Income (Loss)	(5,156,947)	7,712,203	(14,856,020)	(3,675,088)
Income Properties
Business segment data
Total Revenues	7,928,258	6,021,331	22,566,505	18,483,654
Depreciation and Amortization	3,053,295	1,866,162	8,848,101	5,571,785
Identifiable Assets	343,740,067		343,740,067		302,757,565
Income Properties | Operating Segments
Business segment data
Operating Income (Loss)	6,212,742	4,590,689	17,809,761	14,672,265
Capital Expenditures	2,829,567	49,751,977	47,515,911	52,604,951
Commercial Loan Investments
Business segment data
Total Revenues	637,801	534,212	1,727,449	2,050,507
Identifiable Assets	26,984,350		26,984,350		24,032,885
Commercial Loan Investments | Operating Segments
Business segment data
Operating Income (Loss)	637,801	534,212	1,727,449	2,050,507
Real Estate Operations
Business segment data
Total Revenues	2,926,406	4,643,646	45,658,221	18,979,164
Identifiable Assets	44,753,918		44,753,918		58,868,298
Real Estate Operations | Operating Segments
Business segment data
Operating Income (Loss)	2,467,237	3,386,463	30,249,674	14,340,299
Golf Operations
Business segment data
Total Revenues	797,420	1,001,368	3,655,877	3,877,923
Depreciation and Amortization	97,959	64,676	258,649	201,944
Identifiable Assets	5,877,837		5,877,837		3,675,842
Golf Operations | Operating Segments
Business segment data
Operating Income (Loss)	(475,227)	(301,552)	(517,367)	(276,761)
Capital Expenditures	237,560	4,500	2,112,060	17,661
Agriculture And Other
Business segment data
Total Revenues	90,717	10,388	323,617	48,070
Depreciation and Amortization	9,915	14,622	32,684	44,657
Identifiable Assets	15,354,629		15,354,629		$ 19,288,836
Agriculture And Other | Operating Segments
Business segment data
Operating Income (Loss)	71,843	(42,506)	233,770	(105,529)
Capital Expenditures	$ 10,558	$ 2,465	$ 61,586	$ 18,332