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Segments (Net Operating Income by Segment) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Net Operating Income [Abstract] |  |  |  |
Rental income | $ 7,693,017 | $ 6,007,567 | $ 23,602,360 | $ 16,747,951
Property and related expenses | (2,576,781) | (1,902,454) | (7,635,145) | (5,742,548)
Net operating income, as defined | 5,276,852 | 4,209,148 | 16,456,780 | 11,201,773
General and administrative expenses | (1,340,197) | (1,181,714) | (3,947,627) | (3,475,628)
Depreciation and amortization | (2,564,211) | (1,884,193) | (7,723,372) | (5,560,525)
Interest expense | (3,323,740) | (2,630,737) | (10,187,983) | (7,286,351)
Interest income | 9,892 | 26,220 | 78,224 | 61,976
Gain on sale of real estate | 732,908 | 10,858 | 2,121,453 | 5,936,010
Impairment of real estate | (700,000) |  | (700,000) |
Net (loss) income | (1,908,496) | (1,450,418) | (3,902,525) | 877,255
Industrial Office Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income | 6,135,845 | 4,715,807 | 19,166,498 | 13,075,111
Property and related expenses | (2,151,461) | (1,679,926) | (6,510,789) | (4,885,154)
Net operating income, as defined | 3,984,384 | 3,035,881 | 12,655,709 | 8,189,957
Residential Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income | 548,260 | 414,286 | 1,555,405 | 1,117,616
Property and related expenses | (25,061) | (15,530) | (94,142) | (50,377)
Net operating income, as defined | 523,199 | 398,756 | 1,461,263 | 1,067,239
Retail Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income | 1,100,623 | 981,509 | 3,277,619 | 2,952,646
Property and related expenses | (331,354) | (206,998) | (937,811) | (876,694)
Net operating income, as defined | $ 769,269 | $ 774,511 | $ 2,339,808 | 2,075,952
Self Storage Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income |  |  |  | 1,052,266
Property and related expenses |  |  |  | (1,183,641)
Net operating income, as defined |  |  |  | $ (131,375)

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