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Segments (Assets) (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net $ 213,442,944 $ 220,186,759    
Cash equivalents and restricted cash 11,652,864 9,776,215 $ 12,450,950 $ 8,310,575
Other assets, net 5,741,653 7,646,207    
TOTAL ASSETS 227,728,676 233,050,040    
Significant Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Other assets, net 2,632,868 3,087,066    
Office/Industrial Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 133,617,761 138,694,773    
TOTAL ASSETS [2] 136,706,716 143,620,315    
Model Home Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 46,535,828 48,762,869    
TOTAL ASSETS [2] 50,101,419 48,864,060    
Retail/Mixed Use Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 25,572,056 23,650,423    
TOTAL ASSETS [2] $ 26,634,809 $ 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.