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Segments (Net Operating Income by Segment) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net Operating Income [Abstract]        
Rental, fee and other income $ 7,843,654 $ 7,794,585 $ 15,789,760 $ 15,809,218
Property and related expenses (2,662,223) (2,636,063) (5,312,132) (5,273,165)
Net operating income, as defined 5,502,193 5,882,011 11,077,118 11,491,436
General and administrative expenses (1,357,578) (1,439,820) (2,692,672) (2,629,837)
Depreciation and amortization (2,265,889) (2,443,817) (4,604,933) (4,947,333)
Interest expense (3,147,179) (3,311,421) (6,224,156) (6,627,617)
Other expense /(income) 12,449 5,829 (5,842) 15,097
Deferred offering costs (1,507,599)   (1,507,599)  
Income tax expense (88,671) (13,746) (119,465) (108,356)
Gain on sale of real estate 355,276 1,485,589 429,489 2,027,051
Net (loss) income (2,496,998) 164,625 (3,648,060) (779,559)
Office/Industrial Properties [Member]        
Net Operating Income [Abstract]        
Rental, fee and other income 6,058,387 6,535,722 12,215,534 12,779,101
Property and related expenses (2,306,483) (2,295,720) (4,657,093) (4,514,238)
Net operating income, as defined 3,751,904 4,240,002 7,558,441 8,264,864
Model Home Properties [Member]        
Net Operating Income [Abstract]        
Rental, fee and other income 1,169,890 930,062 2,293,657 1,806,607
Property and related expenses (34,825) (35,038) (87,351) (73,995)
Net operating income, as defined 1,135,065 895,024 2,206,306 1,732,612
Retail/Mixed Use Properties [Member]        
Net Operating Income [Abstract]        
Rental, fee and other income 936,139 1,052,289 1,880,059 2,178,893
Property and related expenses (320,915) (305,304) (567,688) (684,933)
Net operating income, as defined $ 615,224 $ 746,985 $ 1,312,371 $ 1,493,960