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Segments (Assets) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net $ 243,068,137 $ 246,969,993    
Cash and cash equivalents 3,436,531 3,116,147 $ 4,703,000 $ 6,626,423
Other assets, net 5,612,568 5,745,982    
TOTAL ASSETS 256,553,880 257,999,077    
Significant Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Other assets, net 10,049,212 7,912,937    
Office/Industrial Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 161,798,825 172,309,537    
TOTAL ASSETS [2] 166,582,487 175,689,722    
Residential Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 46,504,124 34,813,680    
TOTAL ASSETS [2] 43,862,941 35,960,179    
Retail/Mixed Use Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 31,001,394 33,398,992    
TOTAL ASSETS [2] $ 32,622,709 $ 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.