Annual report pursuant to Section 13 and 15(d)

Real Estate and Lease Intangibles - Summary of Total Operating Revenues and Earnings Recognized on Properties Acquired (Detail)

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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