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Segments (Net Operating Income by Segment) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Net Operating Income [Abstract] |  |  |  |  |  |
Rental income | $ 7,661,356 | $ 7,693,017 | $ 23,470,574 | $ 23,602,360 | $ 31,591,870 | $ 23,590,011
Property and related expenses | (2,794,071) | (2,576,781) | (8,067,236) | (7,635,145) | (10,135,345) | (8,515,151)
Net operating income, as defined | 5,169,403 | 5,276,852 | 16,660,838 | 16,456,780 | 22,316,767 | 15,332,319
General and administrative expenses | (1,322,631) | (1,252,299) | (3,960,202) | (3,715,029) | (5,424,479) | (5,193,888)
Depreciation and amortization | (2,399,307) | (2,564,211) | (7,346,640) | (7,723,372) | (10,256,185) | (7,784,917)
Interest expense | (3,191,152) | (3,323,740) | (9,818,767) | (10,187,983) | (13,531,337) | (10,774,660)
Interest income | 10,515 | 9,892 | 25,612 | 78,224 | 85,723 | 150,008
Income tax expense | (53,566) | (87,898) | (154,189) | (232,598) | (213,860) | (172,691)
Impairment of real estate asset |  | (700,000) |  | (700,000) | (948,053) | 0
Gain on sale of real estate | 210,372 | 732,908 | 2,237,423 | 2,121,453 | 2,186,481 | 6,243,640
Net income (loss) | (1,576,366) | (1,908,496) | (2,355,925) | (3,902,525) | (5,571,083) | (2,027,498)
Office/Industrial Properties [Member] |  |  |  |  |  |
Net Operating Income [Abstract] |  |  |  |  |  |
Rental income | 5,924,773 | 6,204,750 | 18,703,971 | 19,258,901 | 25,564,763 | 18,497,621
Property and related expenses | (2,413,777) | (2,220,366) | (6,928,015) | (6,603,192) | (8,747,722) | (7,170,550)
Net operating income, as defined | 3,510,996 | 3,984,384 | 11,775,956 | 12,655,709 | 16,817,041 | 11,327,071
Residential Properties [Member] |  |  |  |  |  |
Net Operating Income [Abstract] |  |  |  |  |  |
Rental income | 983,426 | 548,260 | 2,790,032 | 1,555,405 | 2,278,832 | 1,521,148
Property and related expenses | (35,239) | (25,061) | (109,233) | (94,142) | (113,187) | (63,875)
Net operating income, as defined | 948,187 | 523,199 | 2,680,799 | 1,461,263 | 2,165,645 | 1,457,273
Retail Properties [Member] |  |  |  |  |  |
Net Operating Income [Abstract] |  |  |  |  |  |
Rental income | 1,055,177 | 1,100,623 | 3,234,071 | 3,277,619 | 4,608,517 | 3,960,076
Property and related expenses | (344,957) | (331,354) | (1,029,987) | (937,811) | (1,274,436) | (1,280,726)
Net operating income, as defined | $ 710,220 | $ 769,269 | $ 2,204,083 | $ 2,339,808 | $ 3,334,081 | 2,679,350
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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