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, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Principal payment on financing note receivable $ 237,000         $ 236,867 $ 0 $ 0
Provision for loan (gain) loss   $ 536,867 $ 0 $ 0 $ (500,000) 36,867 0 (5,014,466)
Not Related Mortgage Loans                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Provision for loan (gain) loss               (656,000)
Foreclosure and Sale of Black Bison                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Provision for loan (gain) loss               (832,000)
SWD Enterprise REIT Note                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Interest receivable converted to principal               100,000
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              
SWD Enterprises                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Maximum borrowing capacity             $ 1,500,000  
Provision for loan (gain) loss         $ (500,000) $ 37,000   $ (3,500,000)