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Real Estate and Intangible Assets - Summary of Total Operating Revenues and Earnings Recognized on Properties Acquired (Detail) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 10, 2015 | Feb. 23, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Real Estate Properties [Line Items] |  |  |  |  |  |
Rental revenue |  |  | $ 3,080,240 | $ 1,771,106 | $ 8,483,023 | $ 4,828,033
Spring Valley [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Rental revenue |  | $ 327,904 |  |  |  |
McIntosh Road [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Rental revenue | $ 43,200 |  |  |  |  |
2015 New Real Estate Activity [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Rental revenue |  |  | 629,000 |  | 1,086,976 |
Earnings |  |  | 349,217 |  | $ 575,814 |
2015 New Real Estate Activity [Member] | Espinosa Road [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  |  | Jan. 05, 2015 |
Rental revenue |  |  | 194,586 |  | $ 575,387 |
Earnings |  |  | 81,522 |  | $ 280,393 |
2015 New Real Estate Activity [Member] | Parrish Road [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  |  | Mar. 10, 2015 |
Rental revenue |  |  | 62,958 |  | $ 140,133 |
Earnings |  |  | 8,978 |  | $ 37,927 |
2015 New Real Estate Activity [Member] | Immokalee Exchange [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  |  | Jun. 25, 2015 |
Rental revenue |  |  | 240,026 |  | $ 240,026 |
Earnings |  |  | 152,860 |  | $ 151,637 |
2015 New Real Estate Activity [Member] | Holt County [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  |  | Aug. 20, 2015 |
Rental revenue |  |  | 33,500 |  | $ 33,500 |
Earnings |  |  | 24,343 |  | $ 24,343 |
2015 New Real Estate Activity [Member] | Rock County [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  |  | Aug. 20, 2015 |
Rental revenue |  |  | 33,500 |  | $ 33,500 |
Earnings |  |  | 22,491 |  | $ 22,491 |
2015 New Real Estate Activity [Member] | Bear Mountain [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  |  | Sep. 03, 2015 |
Rental revenue |  |  | 64,430 |  | $ 64,430 |
Earnings |  |  | $ 59,023 |  | $ 59,023 |
2014 New Real Estate Activity [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Rental revenue |  |  |  | 235,607 |  | 269,408
Earnings |  |  |  | $ 77,168 |  | 94,731
2014 New Real Estate Activity [Member] | Collins Road [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  | May 30, 2014 |  |
Rental revenue |  |  |  | $ 45,293 |  | 61,365
Earnings |  |  |  | $ 10,662 |  | 18,940
2014 New Real Estate Activity [Member] | Spring Valley [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  | Jun. 13, 2014 |  |
Rental revenue |  |  |  | $ 67,725 |  | 81,270
Earnings |  |  |  | $ 36,366 |  | 44,700
2014 New Real Estate Activity [Member] | McIntosh Road [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  | Jun. 20, 2014 |  |
Rental revenue |  |  |  | $ 20,549 |  | 24,733
Earnings |  |  |  | $ (41,294) |  | (40,343)
2014 New Real Estate Activity [Member] | Naumann Road [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  | Jul. 23, 2014 |  |
Rental revenue |  |  |  | $ 62,920 |  | 62,920
Earnings |  |  |  | $ 44,514 |  | 44,514
2014 New Real Estate Activity [Member] | Sycamore Road [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  | Jul. 25, 2014 |  |
Rental revenue |  |  |  | $ 34,252 |  | 34,252
Earnings |  |  |  | $ 22,052 |  | 22,052
2014 New Real Estate Activity [Member] | Wauchula Road [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisition Date |  |  |  | Sep. 29, 2014 |  |
Rental revenue |  |  |  | $ 4,868 |  | 4,868
Earnings |  |  |  | $ 4,868 |  | $ 4,868

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