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Fair Value of Financial Instruments - Summary of Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Carrying And Estimated Fair Value Financial Instruments [Line Items]        
Cash and Cash Equivalents, Carrying Value $ 9,041,486 $ 4,060,677 $ 4,219,044 $ 1,881,195
Restricted Cash, Carrying Value 6,643,732 14,060,523    
Commercial Loan Investments, Carrying Value 23,960,467 38,331,956    
Long-Term Debt, Carrying Value 135,553,756 166,796,853    
Interest Rate Swap, Estimated Fair Value 366,690      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Carrying And Estimated Fair Value Financial Instruments [Line Items]        
Cash and Cash Equivalents, Carrying Value 9,041,486 4,060,677    
Restricted Cash, Carrying Value 6,643,732 14,060,523    
Cash and Cash Equivalents, Estimated Fair Value 9,041,486 4,060,677    
Restricted Cash, Estimated Fair Value 6,643,732 14,060,523    
Significant Other Observable Inputs (Level 2) [Member]        
Carrying And Estimated Fair Value Financial Instruments [Line Items]        
Long-Term Debt, Carrying Value 135,553,756 166,796,853    
Long-Term Debt, Estimated Fair Value 141,268,301 172,572,305    
Commercial Portfolio Segment | Significant Other Observable Inputs (Level 2) [Member]        
Carrying And Estimated Fair Value Financial Instruments [Line Items]        
Commercial Loan Investments, Carrying Value 23,960,467 38,331,956    
Commercial Loan Investments, Estimated Fair Value $ 23,960,467 $ 38,460,467