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Real Property Interests (Sale) (Details)
3 Months Ended
Mar. 30, 2016
USD ($)
site
Mar. 22, 2016
USD ($)
site
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Sale        
Gain on sale of real property interest     $ 373,779 $ 72,502
One Wireless Communication Site on March 22, 2016 | Sale        
Sale        
Number of tenant sites sold (in sites) | site   1    
Cash consideration received   $ 800,000    
Gain on sale of real property interest     $ 400,000  
Landmark Dividend LLC | Sale to Related Party | 12 Wireless Communication Sites March 30, 2016 | Sale        
Sale        
Number of tenant sites sold (in sites) | site 12      
Cash consideration received $ 2,000,000      
Gain on sale of real property interest $ 0