Segments (Assets) (Details) - USD ($)		Mar. 31, 2018	Dec. 31, 2017
Segment Reporting Asset Reconciling Item [Line Items]
Land, buildings and improvements, net		$ 246,996,112	$ 240,358,882
Cash and cash equivalents		6,101,402	8,310,575
Other assets, net		6,895,660	7,337,280
TOTAL ASSETS		257,382,710	254,496,865
Significant Reconciling Items [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Other assets, net		4,285,196	5,827,408
Office/Industrial Properties [Member] | Operating Segments [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	[1]	159,800,054	160,422,469
TOTAL ASSETS	[2]	164,361,223	163,041,049
Model Home Properties [Member] | Operating Segments [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	[1]	49,493,788	43,245,832
TOTAL ASSETS	[2]	50,279,675	44,782,943
Retail/Mixed Use Properties [Member] | Operating Segments [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	[1]	30,762,599	30,865,644
TOTAL ASSETS	[2]	$ 32,355,214	$ 32,534,890

[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.