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Segments (Assets) (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net $ 238,521,798 $ 246,969,993    
Cash and cash equivalents 4,534,501 3,116,147 $ 5,371,721 $ 6,626,423
Other assets, net 5,301,862 5,745,982    
TOTAL ASSETS 251,980,421 257,999,077    
Significant Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Other assets, net 8,924,122 7,912,937    
Industrial Office Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 169,196,732 172,309,537    
TOTAL ASSETS [2] 171,270,735 175,689,722    
Residential Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 33,834,310 34,813,680    
TOTAL ASSETS [2] 34,346,130 35,960,179    
Retail Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 31,340,544 33,398,992    
TOTAL ASSETS [2] $ 32,904,933 $ 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.