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Segments (Assets) (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Asset Reconciling Item [Line Items]          
Land, buildings and improvements, net $ 238,595,388 $ 246,969,993   $ 239,948,063  
Total Assets 254,079,359 257,999,077   254,274,393  
Cash and cash equivalents 5,847,369 3,116,147 $ 5,518,204 6,626,423 $ 5,636,002
Other assets, net 5,451,230 5,745,982   5,895,991  
Significant Reconciling Items [Member]          
Segment Reporting Asset Reconciling Item [Line Items]          
Other assets, net 9,636,602 7,912,937   7,699,907  
Office/Industrial Properties [Member] | Operating Segments [Member]          
Segment Reporting Asset Reconciling Item [Line Items]          
Land, buildings and improvements, net [1] 162,357,260 172,309,537   178,776,776  
Total Assets [2] 166,648,955 175,689,722   188,805,090  
Residential Properties [Member] | Operating Segments [Member]          
Segment Reporting Asset Reconciling Item [Line Items]          
Land, buildings and improvements, net [1] 38,280,020 34,813,680   16,888,267  
Total Assets [2] 39,265,806 35,960,179   14,395,904  
Retail Properties [Member] | Operating Segments [Member]          
Segment Reporting Asset Reconciling Item [Line Items]          
Land, buildings and improvements, net [1] 31,893,613 33,398,992   35,395,235  
Total Assets [2] $ 32,680,626 $ 35,320,092   $ 36,747,069  
[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.