BUSINESS SEGMENT DATA - Summary of Operations in Different Segments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Business segment data
Total Revenues	$ 12,838,432	$ 10,959,319
Operating Income	289,197	10,002,714
Gain on Disposition of Assets		6,869,957
Gain on Extinguishment of Debt	636,937
Depreciation and Amortization	4,552,471	3,346,287
Capital Expenditures	144,751,728	930,575
Identifiable Assets	717,035,731		$ 703,286,203
Operating Segments
Business segment data
Operating Income		6,869,957
General and Corporate Expense
Business segment data
Operating Income	(9,548,711)	(5,847,907)
Income Properties
Business segment data
Total Revenues	11,003,031	10,724,418
Depreciation and Amortization	4,547,421	3,339,856
Identifiable Assets	586,557,285		464,285,272
Income Properties | Operating Segments
Business segment data
Operating Income	8,889,936	8,791,930
Capital Expenditures	137,991,507	58,005
Management Fee Income
Business segment data
Total Revenues	702,601
Management Fee Income | Operating Segments
Business segment data
Operating Income	702,601
Interest Income from Commercial Loan Investments
Business segment data
Total Revenues	1,052,049
Identifiable Assets	40,748,068		35,742,218
Interest Income from Commercial Loan Investments | Operating Segments
Business segment data
Operating Income	1,052,049
Capital Expenditures	6,754,375
Real Estate Operations
Business segment data
Total Revenues	80,751	234,901
Identifiable Assets	66,725,192		65,554,619
Real Estate Operations | Operating Segments
Business segment data
Operating Income	(1,443,615)	188,734
Capital Expenditures		870,509
Golf Operations
Business segment data
Identifiable Assets	833,372		833,167
Corporate and Other
Business segment data
Depreciation and Amortization	5,050	6,431
Identifiable Assets	22,171,814		$ 136,870,927
Corporate and Other | Operating Segments
Business segment data
Capital Expenditures	$ 5,846	$ 2,061