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Commercial Loan Investments - Additional Information (Detail)
3 Months Ended 9 Months Ended
May 26, 2016
USD ($)
Sep. 30, 2016
USD ($)
loan
Sep. 30, 2016
USD ($)
loan
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Accounts Notes And Loans Receivable [Line Items]          
Principal Payments Received on Commercial Loan Investments     $ 14,282,500 $ 7,200,909  
Debt discount   $ 4,406,375 4,406,375    
Current Face Amount   23,960,467 23,960,467   $ 38,460,467
Commercial Loan Investments   $ 23,960,467 $ 23,960,467   38,331,956
Commercial Mortgage Backed Securities [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Number of loans owned | loan   3 3    
San Juan, Puerto Rico [Member] | First Mortgage [Member] | Hotel [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Principal Payments Received on Commercial Loan Investments $ 14,500,000        
Debt discount 218,000        
Remaining loan origination fee, net of loan costs 145,000        
Loan costs $ 32,000        
Current Face Amount         14,500,000
Commercial Loan Investments         14,371,489
Sarasota, Florida [Member] | Notes Receivable [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Extended maturity date   2017-06      
Sarasota, Florida [Member] | Notes Receivable [Member] | Retail Shopping Center [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Current Face Amount   $ 8,960,467 $ 8,960,467   8,960,467
Commercial Loan Investments   $ 8,960,467 8,960,467   8,960,467
Dallas, Texas | Mezzanine [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Extended maturity date   2017-09      
Dallas, Texas | Hotel [Member] | Mezzanine [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Current Face Amount   $ 10,000,000 10,000,000   10,000,000
Commercial Loan Investments   10,000,000 10,000,000   $ 10,000,000
Dallas, TX , Sarasota, FL, and Atlanta, GA [Member] | Commercial Mortgage Backed Securities [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Commercial Loan Investments   $ 24,000,000 $ 24,000,000    
Commercial loan investments, average remaining maturity     1 year 1 month 6 days    
Commercial loan investments, weighted average interest rate     8.80%