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. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]              
Provision for loan loss $ 0 $ 0 $ 369,278 $ 4,645,188 $ 0 $ 5,014,466 $ 13,784,137
Not Related Mortgage Loans              
Mortgage Loans on Real Estate [Line Items]              
Provision for loan loss           656,000  
Foreclosure and Sale of Black Bison              
Mortgage Loans on Real Estate [Line Items]              
Provision for loan loss           832,000  
Write Down of Prepaid Asset Related to Black Bison              
Mortgage Loans on Real Estate [Line Items]              
Provision for loan loss             $ 25,000
SWD Enterprise REIT Note              
Mortgage Loans on Real Estate [Line Items]              
Interest receivable converted to principal           $ 100,000