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Segments (Assets) (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Asset Reconciling Item [Line Items]          
Land, buildings and improvements, net $ 243,068,137 $ 246,969,993   $ 239,948,063  
TOTAL ASSETS 256,553,880 257,999,077   254,274,393  
Cash and cash equivalents 3,436,531 3,116,147 $ 4,703,000 6,626,423 $ 5,636,002
Other assets, net 5,612,568 5,745,982   5,895,991  
Significant Reconciling Items [Member]          
Segment Reporting Asset Reconciling Item [Line Items]          
Other assets, net 10,049,212 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 161,798,825 [1] 172,309,537 [1],[2]   178,776,776 [2]  
TOTAL ASSETS 166,582,487 [3] 175,689,722 [3],[4]   188,805,090 [4]  
Residential Properties [Member] | Operating Segments [Member]          
Segment Reporting Asset Reconciling Item [Line Items]          
Land, buildings and improvements, net 46,504,124 [1] 34,813,680 [1],[2]   16,888,267 [2]  
TOTAL ASSETS 43,862,941 [3] 35,960,179 [3],[4]   14,395,904 [4]  
Retail Properties [Member] | Operating Segments [Member]          
Segment Reporting Asset Reconciling Item [Line Items]          
Land, buildings and improvements, net 31,001,394 [1] 33,398,992 [1],[2]   35,395,235 [2]  
TOTAL ASSETS $ 32,622,709 [3] $ 35,320,092 [3],[4]   $ 36,747,069 [4]  
[1] (1) Includes lease intangibles and the land purchase option related to property acquisitions.
[2] Includes lease intangibles and the land purchase option related to property acquisitions.
[3] (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.
[4] 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.