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Commitments and Contingencies - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 10, 2015 USD ($) | Sep. 30, 2015 USD ($) a Well | Mar. 31, 2015 USD ($) | Jan. 31, 2015 USD ($) a | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) a | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Additional rental income | $ 73,749 |  |  |  |  | $ 11,888,091 | $ 7,170,318 | $ 4,027,687
Farm Acres | a |  |  |  |  |  | 13,022 |  |
Cost incurred by tenant |  |  |  |  |  | $ 1,302,009 | 585,947 |
Initial payment made for acquisition of real estate property |  |  |  |  |  | 74,448,512 | 68,626,968 | 37,871,978
Estimated cost |  |  |  |  |  | 3,246,646 | $ 2,619,084 | $ 811,605
Sycamore Road [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  |  |  | $ 933,000 |  |
Lease, acquisition, irrigation improvements, description |  |  |  |  |  | In connection with the follow-on lease we executed upon our acquisition of Sycamore Road in July 2014, we were required to make certain irrigation improvements on the property to increase overall water availability. As of December 31, 2015, these improvements were substantially complete, and we have expended or accrued approximately $933,000 related to the project. Upon finalizing the total cost of these improvements, as stipulated in the lease agreement, we will earn additional rent on the total cost commensurate with the annual yield on the farmland. |  |
Additional rental income |  |  |  |  |  | $ 50,000 |  |
Wauchula Road [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Additional rental income |  |  |  |  |  | $ 90,000 |  |
Farm Acres | a |  |  |  |  |  | 590 |  |
Cost incurred by tenant |  |  |  |  |  | $ 500,000 |  |
Wauchula Road [Member] | Drip Irrigation [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Farm Acres | a |  |  |  |  |  | 125 |  |
Wauchula Road [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Estimated cost of improvements |  |  |  |  | $ 655,000 |  |  |
Wauchula Road [Member] | Maximum [Member] | Drip Irrigation [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Additional compensation committed upon irrigation improvements and upgrades |  |  |  |  |  | $ 1,500,000 |  |
Espinosa Road [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Area of nonfarmable land | a |  |  |  | 4.5 |  |  |  |
Fair compensation amount for nonfarmable land |  |  |  | $ 160,000 |  |  |  |
Parrish Road [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Additional rental income |  |  |  |  |  | 139,000 |  |
Initial payment made for acquisition of real estate property |  |  | $ 3,200,000 |  |  |  |  |
Additional compensation committed upon approval of increase in water permits |  |  | 700,000 |  |  |  |  |
Reimbursement of other miscellaneous costs |  |  | $ 45,000 |  |  |  |  |
Cost of improvements |  |  |  |  |  | 528,815 |  |
Increased estimated cost |  |  |  |  |  | 28,815 |  |
Parrish Road [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Additional compensation committed upon irrigation improvements and upgrades |  |  |  |  |  | 500,000 |  |
Bear Mountain [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  |  |  | $ 362,000 |  |
Removal area of old grape vineyards | a |  | 274 |  |  |  |  |  |
Number of new drilling wells | Well |  | 3 |  |  |  |  |  |
Area of new almond trees | a |  | 800 |  |  |  |  |  |
Estimated cost |  | $ 7,800,000 |  |  |  |  |  |

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