Quarterly report pursuant to Section 13 or 15(d)

Borrowings - Summary of Mortgage Note Payable and Line of Credit (Detail)

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Borrowings - Summary of Mortgage Note Payable and Line of Credit (Detail) - USD ($)
 6 Months Ended
May 09, 2014
Jun. 30, 2016
Jun. 16, 2016
Dec. 31, 2015
Sep. 03, 2015
Dec. 05, 2014
Debt Instrument [Line Items]            
Principal Outstanding   $ 181,526,562   $ 142,733,157    
Debt issuance costs   (1,052,886)   (1,054,222)    
Total mortgage notes and bonds payable, net   $ 180,473,676   141,678,935    
MetLife Mortgage Notes Payable [Member]            
Debt Instrument [Line Items]            
Issuer   MetLife        
Date(s) of Issuance   May 09, 2014        
Initial Commitment $ 100,000,000 $ 100,000,000        
Maturity Date Jan. 05, 2029 Jan. 05, 2029        
Principal Outstanding   $ 87,470,194   $ 87,470,194    
Stated Interest Rate   3.35%   3.35% 3.35%  
Undrawn Commitment   $ 12,529,806   $ 12,529,806    
MetLife Line of Credit [Member]            
Debt Instrument [Line Items]            
Issuer   MetLife        
Date(s) of Issuance   May 09, 2014        
Initial Commitment $ 25,000,000 $ 25,000,000        
Maturity Date Apr. 05, 2024 Apr. 05, 2024        
Principal Outstanding   $ 14,500,000   $ 100,000    
Stated Interest Rate   2.88%   2.58%    
Undrawn Commitment   $ 10,500,000   $ 24,900,000    
Farm Credit CFL Mortgage Notes Payable [Member]            
Debt Instrument [Line Items]            
Issuer   Farm Credit(4)        
Initial Commitment   $ 31,467,880        
Principal Outstanding   $ 30,487,368   $ 21,456,963    
Stated Interest Rate   3.45%   3.42%    
Undrawn Commitment   $ 0   $ 0    
Farmer Mac Bonds Payable [Member]            
Debt Instrument [Line Items]            
Issuer   Farmer Mac        
Initial Commitment   $ 125,000,000 $ 125,000,000     $ 75,000,000
Principal Outstanding   $ 49,069,000   $ 33,706,000    
Stated Interest Rate   2.93%   2.87%    
Undrawn Commitment   $ 75,763,000   $ 41,294,000    
Minimum [Member] | Farm Credit CFL Mortgage Notes Payable [Member]            
Debt Instrument [Line Items]            
Date(s) of Issuance   Sep. 19, 2014        
Maturity Date   Oct. 01, 2016        
Minimum [Member] | Farmer Mac Bonds Payable [Member]            
Debt Instrument [Line Items]            
Date(s) of Issuance   Dec. 11, 2014        
Maturity Date   Dec. 22, 2016        
Maximum [Member] | Farm Credit CFL Mortgage Notes Payable [Member]            
Debt Instrument [Line Items]            
Date(s) of Issuance   Nov. 02, 2015        
Maturity Date   Nov. 01, 2040        
Maximum [Member] | Farmer Mac Bonds Payable [Member]            
Debt Instrument [Line Items]            
Date(s) of Issuance   Mar. 03, 2016        
Maturity Date   Feb. 24, 2023