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Real Estate Securities - Summary of Company's Real Estate Securities (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]    
Par Value $ 30,880,917 $ 25,957,831
Fair Value $ 30,947,171 $ 25,993,258
CMBS 1    
Schedule Of Available For Sale Securities [Line Items]    
Collateral Type Hospitality Hospitality
Maturity Date 2019-08 2019-08
Par Value $ 15,802,417 $ 15,879,331
Fair Value $ 15,846,663 $ 15,914,266
CMBS 1 | LIBOR    
Schedule Of Available For Sale Securities [Line Items]    
Interest Rate 4.65% 4.65%
CMBS 2    
Schedule Of Available For Sale Securities [Line Items]    
Collateral Type Retail Retail
Maturity Date 2019-07 2019-07
Par Value $ 5,078,500 $ 5,078,500
Fair Value $ 5,079,008 $ 5,077,992
CMBS 2 | LIBOR    
Schedule Of Available For Sale Securities [Line Items]    
Interest Rate 3.40% 3.40%
CMBS 3    
Schedule Of Available For Sale Securities [Line Items]    
Collateral Type Hospitality Hospitality
Maturity Date 2019-11 2019-11
Par Value $ 5,000,000 $ 5,000,000
Fair Value $ 5,004,500 $ 5,001,000
CMBS 3 | LIBOR    
Schedule Of Available For Sale Securities [Line Items]    
Interest Rate 0.92% 0.90%
CMBS 4    
Schedule Of Available For Sale Securities [Line Items]    
Collateral Type Hospitality  
Maturity Date 2020-02  
Par Value $ 5,000,000  
Fair Value $ 5,017,000  
CMBS 4 | LIBOR    
Schedule Of Available For Sale Securities [Line Items]    
Interest Rate 3.00%