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Borrowings - Summary of Mortgage Note Payable and Line of Credit (Detail) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Dec. 05, 2014 | May. 09, 2014
Debt Instrument [Line Items] |  |  |  |
Principal Outstanding | $ 160,776,919 | $ 142,733,157 |  |
Undrawn Commitment | $ 60,576,806 | 78,723,806 |  |
MetLife Mortgage Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuer | MetLife |  |  |
Date(s) of Issuance | May 09, 2014 |  |  |
Initial Commitment Amount | $ 100,000,000 |  |  | $ 100,000,000
Maturity Date | Jan. 05, 2029 |  |  |
Principal Outstanding | $ 87,470,194 | $ 87,470,194 |  |
Stated Interest Rate | 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 Amount | $ 25,000,000 |  |  | $ 25,000,000
Maturity Date | Apr. 05, 2024 |  |  |
Principal Outstanding | $ 2,800,000 | $ 100,000 |  |
Stated Interest Rate | 2.86% | 2.58% |  |
Undrawn Commitment | $ 22,200,000 | $ 24,900,000 |  |
Farm Credit CFL Mortgage Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuer | Farm Credit CFL |  |  |
Dates of Issuance, Start | Sep. 19, 2014 |  |  |
Dates of Issuance, End | Nov. 02, 2015 |  |  |
Initial Commitment Amount | $ 22,185,880 |  |  |
Maturity Date | Apr. 04, 2031 |  |  |
Principal Outstanding | $ 21,353,725 | $ 21,456,963 |  |
Stated Interest Rate | 3.42% | 3.42% |  |
Farmer Mac Bonds Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuer | Farmer Mac |  |  |
Date(s) of Issuance | Dec. 11, 2014 |  |  |
Initial Commitment Amount | $ 75,000,000 |  | $ 75,000,000 |
Maturity Date | Sep. 12, 2020 |  |  |
Principal Outstanding | $ 49,153,000 | $ 33,706,000 |  |
Stated Interest Rate | 2.93% | 2.87% |  |
Undrawn Commitment | $ 25,847,000 | $ 41,294,000 |  |

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