COMMERCIAL LOAN AND MASTER LEASE INVESTMENTS - General Information (Details)			3 Months Ended		9 Months Ended
	Nov. 03, 2020 USD ($)	Sep. 25, 2020 USD ($) ft²	Jun. 30, 2020 USD ($) $ / shares	Mar. 31, 2020 USD ($) $ / shares	Sep. 30, 2020 USD ($) ft²	Sep. 30, 2019 USD ($) ft²	Jan. 01, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current expected credit losses reserve					$ 207,000		$ 252,000
Face Amount of Mortgages					$ 39,404,901
Area of Real Estate Property | ft²					751,210	219,333
Purchase price					$ 185,135,000	$ 90,029,000
Loan Origination		$ 400,000
Repayments of Debt		$ 2,070,000.00
Term		25 years
Gain (Loss) on Sales of Loans, Net					$ (352,959)
Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Origination	$ 2,000,000.0
Repayments of Debt	$ 2,070,000.00
Hialeah, FL
Accounts, Notes, Loans and Financing Receivable [Line Items]
Area of Real Estate Property | ft²		108,000
Purchase price		$ 21,000,000
Commercial loan and master lease investments
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 Commercial Loan Investment Sold			4
Number Of Transactions In Which Commercial Loan Investments Were Sold			2
Proceeds from Sale of Loans Held-for-investment			$ 20,000,000.0
Gain (Loss) on Sales of Loans, Net			$ 353,000	$ 2,100,000
Gain (Loss) On Sale Of Loans Held For Investment Per Share, Net Of Tax | $ / shares			$ 0.06	$ 0.33