Annual report pursuant to Section 13 and 15(d)

SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE - Additional Information

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SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE - Additional Information - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]                      
Provision for loan loss $ 0 $ 0 $ 369,278 $ 4,645,188 $ 5,833,000 $ 7,951,137 $ 0 $ 0 $ 5,014,466 $ 13,784,137 $ 0
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