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Segments (Assets) (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Asset Reconciling Item [Line Items]      
Land, buildings and improvements, net $ 220,186,759 $ 240,358,882  
Cash and cash equivalents 9,776,215 8,310,575 $ 7,387,795
Other assets, net 7,646,207 7,337,280  
TOTAL ASSETS 233,050,040 254,496,865  
Significant Reconciling Items [Member]      
Segment Reporting Asset Reconciling Item [Line Items]      
Other assets, net 3,087,066 5,827,408  
Office/Industrial Properties [Member] | Operating Segments [Member]      
Segment Reporting Asset Reconciling Item [Line Items]      
Land, buildings and improvements, net [1] 138,694,773 160,422,468  
TOTAL ASSETS [2] 143,620,315 163,041,049  
Model Home Properties [Member] | Operating Segments [Member]      
Segment Reporting Asset Reconciling Item [Line Items]      
Land, buildings and improvements, net [1] 48,762,869 43,245,832  
TOTAL ASSETS [2] 48,864,060 44,782,943  
Retail/Mixed Use Properties [Member] | Operating Segments [Member]      
Segment Reporting Asset Reconciling Item [Line Items]      
Land, buildings and improvements, net [1] 23,650,423 30,865,644  
TOTAL ASSETS [2] $ 27,702,384 $ 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.