BUSINESS SEGMENT DATA - Summary of Operations in Different Segments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Business segment data
Total Revenues	$ 38,713,284	$ 18,354,435
Operating Income (Loss)	22,849,411	6,393,316
Depreciation and Amortization	2,762,575	2,067,367
Capital Expenditures	23,557,357	2,746,581
Identifiable Assets	414,941,060		$ 408,623,426
General and Corporate Expense
Business segment data
Operating Income (Loss)	(3,756,196)	(7,074,732)
Income Properties
Business segment data
Total Revenues	7,073,240	6,429,241
Depreciation and Amortization	2,686,312	1,981,050
Identifiable Assets	323,512,072		302,757,565
Income Properties | Operating Segments
Business segment data
Operating Income (Loss)	5,661,527	5,252,534
Capital Expenditures	21,937,532	2,730,714
Commercial Loan Investments
Business segment data
Total Revenues	536,489	881,245
Identifiable Assets	24,034,727		24,032,885
Commercial Loan Investments | Operating Segments
Business segment data
Operating Income (Loss)	536,489	881,245
Real Estate Operations
Business segment data
Total Revenues	29,474,460	9,560,898
Identifiable Assets	49,157,129		58,868,298
Real Estate Operations | Operating Segments
Business segment data
Operating Income (Loss)	20,317,611	7,303,857
Golf Operations
Business segment data
Total Revenues	1,474,944	1,464,359
Depreciation and Amortization	65,367	68,649
Identifiable Assets	5,852,607		3,675,842
Golf Operations | Operating Segments
Business segment data
Operating Income (Loss)	(23,734)	59,771
Capital Expenditures	1,607,742
Agriculture and Other Income
Business segment data
Total Revenues	154,151	18,692
Depreciation and Amortization	10,896	17,668
Identifiable Assets	12,384,525		$ 19,288,836
Agriculture and Other Income | Operating Segments
Business segment data
Operating Income (Loss)	113,714	(29,359)
Capital Expenditures	$ 12,083	$ 15,867