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Segments (Assets) (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Asset Reconciling Item [Line Items]    
Land, buildings and improvements, net $ 240,358,882 $ 246,969,993
Cash and cash equivalents 8,310,575 7,387,795
Other assets, net 7,337,280 5,745,982
TOTAL ASSETS 254,496,865 257,999,077
Significant Reconciling Items [Member]    
Segment Reporting Asset Reconciling Item [Line Items]    
Other assets, net 5,827,408 3,641,289
Office/Industrial Properties [Member] | Operating Segments [Member]    
Segment Reporting Asset Reconciling Item [Line Items]    
Land, buildings and improvements, net [1] 160,422,468 172,309,537
TOTAL ASSETS [2] 163,041,049 175,689,722
Model Home Properties [Member] | Operating Segments [Member]    
Segment Reporting Asset Reconciling Item [Line Items]    
Land, buildings and improvements, net [1] 43,245,832 34,813,680
TOTAL ASSETS [2] 44,782,943 35,960,179
Retail/Mixed Use Properties [Member] | Operating Segments [Member]    
Segment Reporting Asset Reconciling Item [Line Items]    
Land, buildings and improvements, net [1] 30,865,644 33,398,992
TOTAL ASSETS [2] $ 32,534,890 $ 35,320,092
[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.