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Segments (Net Operating Income by Segment) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net Operating Income [Abstract]    
Rental, fees and other income $ 7,179,264 $ 8,224,834
Property and related expenses (2,763,550) (2,649,909)
Net operating income, as defined 4,415,714 5,574,925
General and administrative expenses (1,760,703) (1,333,465)
Depreciation and amortization (2,210,081) (2,339,044)
Interest expense (2,545,203) (3,076,976)
Other income (expense) 5,524 (18,291)
Income tax expense (81,430) (32,423)
Gain on sale of real estate 1,214,242 74,213
Net loss (961,937) (1,151,061)
Office/Industrial Properties [Member]    
Net Operating Income [Abstract]    
Rental, fees and other income 5,454,153 6,157,147
Property and related expenses (2,504,787) (2,350,611)
Net operating income, as defined 2,949,366 3,806,536
Model Home Properties [Member]    
Net Operating Income [Abstract]    
Rental, fees and other income 1,081,684 1,123,767
Property and related expenses (50,422) (52,526)
Net operating income, as defined 1,031,262 1,071,241
Retail/Mixed Use Properties [Member]    
Net Operating Income [Abstract]    
Rental, fees and other income 643,427 943,920
Property and related expenses (208,341) (246,772)
Net operating income, as defined $ 435,086 $ 697,148