BUSINESS SEGMENT DATA - Summary of Operations in Different Segments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Business segment data
Revenues	$ 18,428,697	$ 12,380,602	$ 57,113,481	$ 73,931,669
Operating Income	2,784,474	3,757,449	41,269,806	34,647,267
Other Gains (Losses) and Income		(266)	22,035,666	2,226,260
Depreciation and Amortization	3,857,240	3,161,169	11,612,557	9,139,434
Identifiable Assets	476,159,770		476,159,770		$ 466,130,378
Operating Segments
Business segment data
Capital Expenditures	753,134	3,077,685	33,179,734	49,689,557
General and Corporate Expense
Business segment data
Operating Income	(6,904,610)	(5,156,681)	(19,912,656)	(17,082,280)
Income Properties
Business segment data
Revenues	9,360,155	7,928,258	28,347,181	22,566,505
Depreciation and Amortization	3,748,389	3,053,295	11,282,566	8,848,101
Identifiable Assets	417,219,521		417,219,521		388,602,721
Income Properties | Operating Segments
Business segment data
Operating Income	7,586,315	6,212,742	22,669,423	17,809,761
Capital Expenditures	403,967	2,829,567	29,288,555	47,515,911
Commercial Loan Investments
Business segment data
Revenues	41,262	637,801	615,728	1,727,449
Identifiable Assets					11,963,777
Commercial Loan Investments | Operating Segments
Business segment data
Operating Income	41,262	637,801	615,728	1,727,449
Real Estate Operations
Business segment data
Revenues	8,012,509	2,926,406	24,476,153	45,658,221
Identifiable Assets	37,162,140		37,162,140		43,296,528
Real Estate Operations | Operating Segments
Business segment data
Operating Income	2,440,190	2,467,237	16,497,902	30,249,674
Capital Expenditures	262,436		3,768,230
Golf Operations
Business segment data
Revenues	1,014,771	797,420	3,652,045	3,655,877
Depreciation and Amortization	100,732	97,959	303,681	258,649
Identifiable Assets	4,266,178		4,266,178		6,262,634
Golf Operations | Operating Segments
Business segment data
Operating Income	(373,511)	(475,227)	(643,115)	(517,367)
Capital Expenditures	86,731	237,560	111,611	2,112,060
Agriculture and Other Income
Business segment data
Revenues		90,717	22,374	323,617
Depreciation and Amortization	8,119	9,915	26,310	32,684
Identifiable Assets	17,511,931		17,511,931		$ 16,004,718
Agriculture and Other Income | Operating Segments
Business segment data
Operating Income	$ (5,172)	71,843	6,858	233,770
Capital Expenditures		$ 10,558	$ 11,338	$ 61,586