BUSINESS SEGMENT DATA - Summary of Operations in Different Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Business segment data
Total Revenues	$ 13,009,743	$ 10,688,831	$ 25,848,175	$ 21,648,150
Operating Income	10,773,190	14,632,126	11,062,387	24,634,840
Gain on Disposition of Assets	7,075,858	11,811,907	7,075,858	18,681,864
Gain on Extinguishment of Debt	504,544		1,141,481
Depreciation and Amortization	5,021,187	4,074,587	9,573,658	7,420,874
Capital Expenditures	256,556	49,841,471	145,008,284	50,772,046
Identifiable Assets	688,852,871		688,852,871		$ 703,286,203
Operating Segments
Business segment data
Operating Income	7,075,858	11,811,907	7,075,858	18,681,864
General and Corporate Expense
Business segment data
Operating Income	(7,191,858)	(6,193,763)	(16,740,569)	(12,041,670)
Income Properties
Business segment data
Total Revenues	11,473,112	10,375,295	22,476,143	21,099,713
Depreciation and Amortization	5,015,590	4,068,968	9,563,011	7,408,824
Identifiable Assets	560,086,707		560,086,707		464,285,272
Income Properties | Operating Segments
Business segment data
Operating Income	8,904,650	8,740,575	17,794,586	17,532,505
Capital Expenditures	250,085	40,972,487	138,241,592	41,030,492
Management Services
Business segment data
Total Revenues	695,051		1,397,652
Management Services | Operating Segments
Business segment data
Operating Income	695,051		1,397,652
Interest Income from Commercial Loan Investments
Business segment data
Total Revenues	835,190	52,765	1,887,239	52,765
Identifiable Assets	18,494,950		18,494,950		35,742,218
Interest Income from Commercial Loan Investments | Operating Segments
Business segment data
Operating Income	835,190	52,765	1,887,239	52,765
Capital Expenditures		7,840,000	6,754,375	7,840,000
Real Estate Operations
Business segment data
Total Revenues	6,390	260,771	87,141	495,672
Identifiable Assets	67,014,688		67,014,688		65,554,619
Real Estate Operations | Operating Segments
Business segment data
Operating Income	(50,245)	220,642	(1,493,860)	409,376
Capital Expenditures		1,028,984		1,899,493
Golf Operations
Business segment data
Identifiable Assets	833,167		833,167		833,167
Corporate and Other
Business segment data
Depreciation and Amortization	5,597	$ 5,619	10,647	12,050
Identifiable Assets	42,423,359		42,423,359		$ 136,870,927
Corporate and Other | Operating Segments
Business segment data
Capital Expenditures	$ 6,471		$ 12,317	$ 2,061