COMMERCIAL LOAN INVESTMENTS - General Information (Details)			3 Months Ended
	Feb. 28, 2020 USD ($) a	Jan. 13, 2020 USD ($)	Mar. 31, 2020 USD ($) $ / shares	Mar. 31, 2019 loan	Jan. 01, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current expected credit losses reserve			$ 1,904,500		$ 252,000
Face Amount of Mortgages			41,445,000
Origination fee received		$ 70,000
First Mortgage Honolulu, Hawaii Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount of Mortgages		$ 3,500,000
Term		1 year
Interest rate (as a percent)		11.00%
Origination fee (as a percent)		2.00%
First Mortgage, Property Land JV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face Amount of Mortgages	$ 3,400,000
Area of land (in acres) | a	12
Term	1 year
Interest rate (as a percent)	9.50%
Origination fee (as a percent)	1.50%
Origination fee received	$ 51,000
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate impairment charges after tax			$ 1,900,000
Aggregate impairment charges per share, after tax | $ / shares			$ 0.30
Number of mortgage loan investments | loan				0