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Fair Value of Financial Instruments - Schedule of Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Carrying Amount    
Financial assets    
Cash and cash equivalents $ 5,765,417 $ 1,406,331
Commercial mortgage loans, net 51,549,976 32,094,441
Total 57,315,393 33,500,772
Financial liabilities    
Total 28,071,000 17,113,000
Carrying Amount | Real Estate Securities    
Financial liabilities    
Repurchase agreements 18,771,000 17,113,000
Carrying Amount | Commercial Mortgage Loans    
Financial liabilities    
Repurchase agreements 9,300,000  
Estimated Fair Value    
Financial assets    
Cash and cash equivalents 5,765,417 1,406,331
Commercial mortgage loans, net 51,775,400 32,094,441
Total 57,540,817 33,500,772
Financial liabilities    
Total 28,071,000 17,113,000
Estimated Fair Value | Real Estate Securities    
Financial liabilities    
Repurchase agreements 18,771,000 $ 17,113,000
Estimated Fair Value | Commercial Mortgage Loans    
Financial liabilities    
Repurchase agreements $ 9,300,000