Quarterly report pursuant to Section 13 or 15(d)

Borrowings - Additional Information (Detail)

v3.2.0.727
Borrowings - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 25, 2015
May. 08, 2015
Jan. 05, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Apr. 09, 2015
Mar. 10, 2015
Dec. 31, 2014
May. 09, 2014
Debt Instrument [Line Items]                        
Weighted average interest rate on borrowings         3.60% 3.70% 3.60% 3.60%        
Line of credit, carrying value $ 2,800,000       $ 2,800,000   $ 2,800,000       $ 4,000,000  
Undrawn Commitment 107,655,002       107,655,002   107,655,002       $ 125,993,002  
Farm Credit Loan Maturing in May 2030 [Member]                        
Debt Instrument [Line Items]                        
Total borrowings from credit notes payable $ 18,100,000       $ 18,100,000   $ 18,100,000          
Farm Credit Loan Maturing in May 2030 [Member] | After April 30, 2018 [Member]                        
Debt Instrument [Line Items]                        
Percentage added to LIBOR             3.00%          
Farm Credit Interest Only Loans[Member]                        
Debt Instrument [Line Items]                        
Debt instrument, fixed rate of interest 3.20%       3.20%   3.20%          
Aggregate notes payable                 $ 3,300,000 $ 3,300,000    
Expiration term             5 years          
Farm Credit Additional Loan[Member]                        
Debt Instrument [Line Items]                        
Additional borrowings     $ 2,600,000                  
Farm Credit Additional Loan[Member] | Through April 30, 2018 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, fixed rate of interest 2.90%       2.90%   2.90%          
Farm Credit Additional Loan[Member] | After April 30, 2018 [Member]                        
Debt Instrument [Line Items]                        
Credit notes payable interest rate there after, Description             LIBOR plus 3.00%          
MetLife [Member]                        
Debt Instrument [Line Items]                        
Note payable, outstanding $ 66,300,000       $ 66,300,000   $ 66,300,000          
Line of credit, carrying value 2,800,000       2,800,000 $ 3,000,000 2,800,000 $ 3,000,000        
Undrawn Commitment 55,900,000       55,900,000   55,900,000          
Remaining borrowing capacity $ 16,500,000       $ 16,500,000   $ 16,500,000          
Mortgage Notes Payable [Member] | Farm Credit Loan Maturing in May 2030 [Member]                        
Debt Instrument [Line Items]                        
Blended fixed interest rate 12.70%       12.70%   12.70%          
Debt instrument face amount $ 18,425,880       $ 18,425,880   $ 18,425,880          
Debt instrument, fixed rate of interest 3.38%       3.38%   3.38%       3.53%  
Bond Payable [Member] | Farmer Mac Facility [Member]                        
Debt Instrument [Line Items]                        
Debt instrument face amount $ 75,000,000       $ 75,000,000   $ 75,000,000          
Debt instrument, fixed rate of interest   2.60%   3.25%                
Additional borrowings 23,200,000 $ 9,400,000   $ 10,200,000                
Expiration term   3 years   5 years                
Mortgage Note Payable [Member] | Mortgage Notes and Bonds Payable [Member]                        
Debt Instrument [Line Items]                        
Aggregate fair value of mortgage notes payable outstanding 107,400,000       107,400,000   107,400,000          
Mortgage notes payable, carrying value $ 107,700,000       $ 107,700,000   $ 107,700,000          
Mortgage Note Payable [Member] | MetLife [Member]                        
Debt Instrument [Line Items]                        
Blended fixed interest rate 3.61%       3.61%   3.61%          
Debt instrument face amount $ 100,000,000       $ 100,000,000   $ 100,000,000         $ 100.0
Maturity Date             Jan. 05, 2029          
Fixed interest rate             3.50%          
Commitment fee on undrawn amount 0.20%       0.20%   0.20%          
Period for interest rate adjustment             3 years          
Expiration date of commitment             Dec. 31, 2016          
Line of credit, carrying value $ 2,800,000       $ 2,800,000   $ 2,800,000          
Debt instrument, fixed rate of interest 3.61%       3.61%   3.61%       3.61%  
Undrawn Commitment $ 33,668,002       $ 33,668,002   $ 33,668,002       $ 33,668,002  
Line of Credit [Member] | MetLife [Member]                        
Debt Instrument [Line Items]                        
Debt instrument face amount $ 25,000,000       $ 25,000,000   $ 25,000,000         $ 25.0
Maturity Date             Apr. 05, 2024          
Commitment fee on undrawn amount 0.20%       0.20%   0.20%          
Debt instrument interest rate             Three-month LIBOR plus a spread of 2.50%          
Percentage added to LIBOR             2.50%          
Minimum annualized rate             2.75%          
Debt instrument, fixed rate of interest 2.77%       2.77%   2.77%       2.75%  
Undrawn Commitment $ 22,200,000       $ 22,200,000   $ 22,200,000       $ 21,000,000