COMMERCIAL LOAN INVESTMENTS - General Information (Details)				12 Months Ended
	Oct. 17, 2019 USD ($) item	Jul. 05, 2019 USD ($) a	Jun. 14, 2019 USD ($) a item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount of Mortgages				$ 34,570,000
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage loan investments | loan					0
First Mortgage, 72-Acre Land Parcel, Orlando, FL
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount of Mortgages			$ 8,000,000	$ 8,000,000
Area of land (in acres) | a			72
Term			1 year
Number of extensions | item			2
Extension term			1 year
Interest rate (as a percent)			12.00%	12.00%
Origination fee (as a percent)			2.00%
Origination fee received			$ 160,000
Mortgage Note, 400 Josephine Street, Austin, TX
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount of Mortgages		$ 8,300,000		$ 8,250,000
Term		1 year
Interest rate (as a percent)		11.50%		11.50%
Origination fee (as a percent)		1.00%
Origination fee received		$ 82,500
First Mortgage, Golf Club, Daytona Beach, FL
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term	1 year
Number of extensions | item	2
Extension term	6 months
Interest rate (as a percent)	7.50%
Origination fee (as a percent)	1.50%
Origination fee received	$ 31,000
LPGA Buyer Loan - Daytona Beach, FL
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount of Mortgages	$ 2,100,000			$ 2,070,000
Interest rate (as a percent)				7.50%
Carpenter Hotel-400 Josephine Street, Austin, TX
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount of Mortgages		$ 16,250,000		$ 16,250,000
Area of land (in acres) | a		1.4
Term		99 years