Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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BUSINESS SEGMENT DATA - Description (Details)	3 Months Ended		6 Months Ended		12 Months Ended
BUSINESS SEGMENT DATA - Description (Details)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) loan segment	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Business segment data
Number of operating segment \| segment			4
Assets	$ 688,852,871		$ 688,852,871		$ 703,286,203
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
Income Properties
Business segment data
Assets	560,086,707		560,086,707		464,285,272
Depreciation and Amortization	5,015,590	$ 4,068,968	9,563,011	$ 7,408,824
Management Services
Business segment data
Assets	0		0		0
Depreciation and Amortization			0		0
Capital Expenditures			0		0
Golf Operations
Business segment data
Assets	$ 833,167		$ 833,167		$ 833,167
Product concentration \| Identifiable assets \| Income Properties
Business segment data
Percentage of total			81.30%		66.00%
Product concentration \| Consolidated revenues \| Income Properties
Business segment data
Percentage of total			87.00%		97.50%
Fixed-rate mezzanine \| Commercial loans
Business segment data
Mortgage Loans on Real Estate, Number of Loans \| loan			1