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Segments (Net Operating Income by Segment) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Net Operating Income [Abstract]    
Rental income $ 31,832,530 $ 31,591,870
Property and related expenses (10,723,464) (10,135,345)
Net operating income, as defined 22,932,256 22,316,767
General and administrative expenses (5,482,170) (5,065,579)
Depreciation and amortization (9,710,265) (10,256,185)
Interest expense (12,954,079) (13,531,337)
Interest income 30,287 85,723
Gain on sale of real estate 2,623,469 2,186,481
Acquisition costs (72,897) (145,040)
Income tax expense (208,681) (213,860)
Impairment of real estate 0 (948,053)
Net loss (2,842,080) (5,571,083)
Office/Industrial Properties [Member]    
Net Operating Income [Abstract]    
Rental income 25,442,638 25,564,763
Property and related expenses (9,284,091) (8,747,722)
Net operating income, as defined 16,158,547 16,817,041
Model Home Properties [Member]    
Net Operating Income [Abstract]    
Rental income 3,899,570 2,278,832
Property and related expenses (154,206) (113,187)
Net operating income, as defined 3,745,364 2,165,645
Retail/Mixed Use Properties [Member]    
Net Operating Income [Abstract]    
Rental income 4,334,047 4,608,517
Property and related expenses (1,305,702) (1,274,436)
Net operating income, as defined $ 3,028,345 $ 3,334,081