Annual report pursuant to Section 13 and 15(d)

SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE - Additional Information (Details)

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SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 12, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Principal payment on financing note receivable $ 237,000         $ 5,000,000 $ 0 $ 0
Provision for loan gain   $ (536,867) $ 0 $ 0 $ 500,000 $ 0 (36,867) 0
Compass REIT Loan                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Maximum borrowing capacity $ 1,300,000.0              
SWD Enterprises                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Maximum borrowing capacity               $ 1,500,000.0
Provision for loan gain             $ (37,000)