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Segments (Net Operating Income by Segment) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Net Operating Income [Abstract]    
Rental income $ 31,141,558 $ 31,832,530
Property and related expenses (10,886,719) (10,723,464)
Net operating income, as defined 21,457,294 22,650,678
General and administrative expenses (4,532,703) (5,200,592)
Depreciation and amortization (9,101,605) (9,710,265)
Interest expense (13,041,016) (12,954,079)
Interest income 55,909 30,287
Gain on sale of real estate 12,200,138 2,623,469
Deferred offering costs (1,507,599)  
Impairment of real estate assets (532,951)  
Acquisition costs (26,177) (72,897)
Income tax expense (518,567) (208,681)
Net income (loss) 4,452,723 (2,842,080)
Office/Industrial Properties [Member]    
Net Operating Income [Abstract]    
Rental income 24,037,363 25,140,525
Property and related expenses (9,494,885) (9,263,556)
Net operating income, as defined 14,542,478 15,876,969
Model Home Properties [Member]    
Net Operating Income [Abstract]    
Rental income 4,642,159 3,899,570
Property and related expenses (174,238) (154,206)
Net operating income, as defined 4,467,921 3,745,364
Retail/Mixed Use Properties [Member]    
Net Operating Income [Abstract]    
Rental income 3,664,491 4,334,047
Property and related expenses (1,217,596) (1,305,702)
Net operating income, as defined $ 2,446,895 $ 3,028,345