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Segments (Assets) (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net $ 211,712,230 $ 220,186,759    
Cash equivalents and restricted cash 12,839,227 9,776,215 $ 6,101,402 $ 8,310,575
Other assets, net 5,555,299 7,646,207    
TOTAL ASSETS 225,066,224 233,050,040    
Significant Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Other assets, net 514,767 3,087,066    
Office/Industrial Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 133,923,477 138,694,773    
TOTAL ASSETS [2] 138,049,968 143,620,315    
Model Home Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 43,624,148 48,762,869    
TOTAL ASSETS [2] 47,453,048 48,864,060    
Retail/Mixed Use Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 24,658,611 23,650,423    
TOTAL ASSETS [2] $ 26,209,214 $ 27,702,384    
[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.