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Segments (Assets) (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net $ 239,318,757 $ 240,358,882    
Cash equivalents and restricted cash 11,841,100 8,310,575 $ 7,291,501 $ 7,387,795
Other assets, net 5,994,522 7,337,280    
TOTAL ASSETS 259,631,357 254,496,865    
Significant Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Other assets, net 8,471,501 5,827,408    
Office/Industrial Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 157,324,874 160,422,469    
TOTAL ASSETS [2] 157,667,998 163,041,049    
Model Home Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 50,075,254 43,245,832    
TOTAL ASSETS [2] 50,284,837 44,782,943    
Retail/Mixed Use Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 30,499,383 30,865,644    
TOTAL ASSETS [2] $ 31,365,922 $ 32,534,890    
[1] Includes lease intangibles and the land purchase option related to property acquisitions.
[2] Includes land, buildings and improvements, current receivables, deferred rent receivables and deferred leasing costs and other related intangible assets, all shown on a net basis.