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Fair Value of Financial Instruments - Summary of Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Carrying And Estimated Fair Value Financial Instruments [Line Items]        
Cash and Cash Equivalents, Carrying Value $ 24,742,236 $ 4,060,677 $ 31,674,420 $ 1,881,195
Restricted Cash, Carrying Value 10,568,618 14,060,523    
Commercial Loan Investments, Carrying Value 23,960,467 38,331,956    
Long-Term Debt, Carrying Value 153,887,378 166,796,853    
Interest Rate Swap, Estimated Fair Value 545,821      
Level 1 [Member]        
Carrying And Estimated Fair Value Financial Instruments [Line Items]        
Cash and Cash Equivalents, Carrying Value 24,742,236 4,060,677    
Restricted Cash, Carrying Value 10,568,618 14,060,523    
Cash and Cash Equivalents, Estimated Fair Value 24,742,236 4,060,677    
Restricted Cash, Estimated Fair Value 10,568,618 14,060,523    
Level 2 [Member]        
Carrying And Estimated Fair Value Financial Instruments [Line Items]        
Long-Term Debt, Carrying Value 153,887,378 166,796,853    
Interest Rate Swap, Carrying Value 545,821      
Commercial Loan Investments, Estimated Fair Value 23,960,467 38,460,467    
Long-Term Debt, Estimated Fair Value 158,562,177 172,572,305    
Interest Rate Swap, Estimated Fair Value 545,821      
Commercial Portfolio Segment | Level 2 [Member]        
Carrying And Estimated Fair Value Financial Instruments [Line Items]        
Commercial Loan Investments, Carrying Value $ 23,960,467 $ 38,331,956