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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)