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Segments (Net Operating Income by Segment) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Net Operating Income [Abstract] |  |  |  |  |  |
Rental income | $ 7,794,585 | $ 7,658,273 | $ 15,809,218 | $ 15,909,341 | $ 31,591,870 | $ 23,590,011
Property and related expenses | (2,636,063) | (2,585,013) | (5,273,165) | (5,058,364) | (10,135,345) | (8,515,151)
Net operating income, as defined | 5,882,011 | 5,221,261 | 11,491,436 | 11,179,927 | 22,316,767 | 15,332,319
General and administrative expenses | (1,439,820) | (1,232,319) | (2,629,837) | (2,462,730) | (5,424,479) | (5,193,888)
Depreciation and amortization | (2,443,817) | (2,499,630) | (4,947,333) | (5,159,161) | (10,256,185) | (7,784,917)
Interest expense | (3,311,421) | (3,501,199) | (6,627,617) | (6,864,243) | (13,531,337) | (10,774,660)
Interest income | 5,829 | 46,593 | 15,097 | 68,332 | 85,723 | 150,008
Income tax expense | (13,746) | (76,152) | (108,356) | (144,700) | (213,860) | (172,691)
Gain on sale of real estate | 1,485,589 | 1,213,060 | 2,027,051 | 1,388,545 | 2,186,481 | 6,243,640
Impairment of real estate assets |  |  |  |  | (948,053) | 0
Net income (loss) | 164,625 | (828,386) | (779,559) | (1,994,030) | (5,571,083) | (2,027,498)
Office/Industrial Properties [Member] |  |  |  |  |  |
Net Operating Income [Abstract] |  |  |  |  |  |
Rental income | 6,535,722 | 6,200,968 | 12,779,101 | 13,194,587 | 25,564,763 | 18,497,621
Property and related expenses | (2,295,720) | (2,140,237) | (4,514,238) | (4,373,491) | (8,747,722) | (7,170,550)
Net operating income, as defined | 4,240,002 | 4,060,731 | 8,264,864 | 8,821,096 | 16,817,041 | 11,327,071
Residential Properties [Member] |  |  |  |  |  |
Net Operating Income [Abstract] |  |  |  |  |  |
Rental income | 930,062 | 567,281 | 1,806,607 | 955,681 | 2,278,832 | 1,521,148
Property and related expenses | (35,038) | (61,376) | (73,995) | (78,416) | (113,187) | (63,875)
Net operating income, as defined | 895,024 | 505,905 | 1,732,612 | 877,265 | 2,165,645 | 1,457,273
Retail Properties [Member] |  |  |  |  |  |
Net Operating Income [Abstract] |  |  |  |  |  |
Rental income | 1,052,289 | 1,038,025 | 2,178,893 | 2,088,023 | 4,608,517 | 3,960,076
Property and related expenses | (305,304) | (383,400) | (684,933) | (606,457) | (1,274,436) | (1,280,726)
Net operating income, as defined | $ 746,985 | $ 654,625 | $ 1,493,960 | $ 1,481,566 | $ 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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