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Real Estate and Lease Intangibles - Summary of Total Operating Revenues and Earnings Recognized on Properties Acquired (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 05, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Real Estate Properties [Line Items] |  |  |  |
Rental revenue |  | $ 17,305,469 | $ 11,888,091 | $ 7,170,318
Parrish Road |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Rental revenue | $ 139,073 |  |  |
Bear Mountain |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Rental revenue |  | 5,000,000 |  |
2016 New Real Estate Activity |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Rental revenue |  | 2,636,087 |  |
Earnings |  | 196,300 |  |
Non-recurring acquisition-related costs |  | $ 206,210 |  |
2016 New Real Estate Activity | Gunbarrel Road |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  | Mar. 03, 2016 |  |
Rental revenue |  | $ 1,316,960 |  |
Earnings |  | $ (210,622) |  |
2016 New Real Estate Activity | Calaveras Avenue |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  | Apr. 05, 2016 |  |
Rental revenue |  | $ 570,615 |  |
Earnings |  | $ (6,745) |  |
2016 New Real Estate Activity | Orange Avenue |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  | Jul. 01, 2016 |  |
Rental revenue |  | $ 145,587 |  |
Earnings |  | $ 31,442 |  |
2016 New Real Estate Activity | Lithia Road |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  | Aug. 11, 2016 |  |
Rental revenue |  | $ 37,927 |  |
Earnings |  | $ (16,741) |  |
2016 New Real Estate Activity | Baca County |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  | Sep. 01, 2016 |  |
Rental revenue |  | $ 127,911 |  |
Earnings |  | $ 122,687 |  |
2016 New Real Estate Activity | Diego Ranch |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  | Sep. 14, 2016 |  |
Rental revenue |  | $ 186,328 |  |
Earnings |  | $ 141,404 |  |
2016 New Real Estate Activity | Nevada Ranch |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  | Sep. 14, 2016 |  |
Rental revenue |  | $ 172,277 |  |
Earnings |  | $ 128,093 |  |
2016 New Real Estate Activity | Central Avenue |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  | Oct. 13, 2016 |  |
Rental revenue |  | $ 70,773 |  |
Earnings |  | $ (927) |  |
2016 New Real Estate Activity | Horse Creek |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  | Dec. 28, 2016 |  |
Rental revenue |  | $ 7,709 |  |
Earnings |  | $ 7,709 |  |
2015 New Real Estate Activity |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Rental revenue |  |  | 1,975,424 |
Earnings |  |  | 182,405 |
Non-recurring acquisition-related costs |  |  | $ 388,594 |
2015 New Real Estate Activity | Espinosa Road |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  |  | Jan. 05, 2015 |
Rental revenue |  |  | $ 769,972 |
Earnings |  |  | $ (33,169) |
2015 New Real Estate Activity | Parrish Road |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  |  | Mar. 10, 2015 |
Rental revenue |  |  | $ 203,341 |
Earnings |  |  | $ (105,830) |
2015 New Real Estate Activity | Immokalee Exchange |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  |  | Jun. 25, 2015 |
Rental revenue |  |  | $ 480,052 |
Earnings |  |  | $ 40,504 |
2015 New Real Estate Activity | Holt County |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  |  | Aug. 20, 2015 |
Rental revenue |  |  | $ 105,954 |
Earnings |  |  | $ 24,716 |
2015 New Real Estate Activity | Rock County |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  |  | Aug. 20, 2015 |
Rental revenue |  |  | $ 105,954 |
Earnings |  |  | $ 19,153 |
2015 New Real Estate Activity | Bear Mountain |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  |  | Sep. 03, 2015 |
Rental revenue |  |  | $ 271,599 |
Earnings |  |  | $ 249,958 |
2015 New Real Estate Activity | Corbitt Road |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  |  | Nov. 02, 2015 |
Rental revenue |  |  | $ 29,970 |
Earnings |  |  | $ (13,434) |
2015 New Real Estate Activity | Reagan Road |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Acquisition Date |  |  | Dec. 22, 2015 |
Rental revenue |  |  | $ 8,582 |
Earnings |  |  | $ 507 |

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