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Segments (Net Operating Income by Segment) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Net Operating Income [Abstract] |  |
Rental income | $ 31,832,530 | $ 31,591,870
Property and related expenses | (10,723,464) | (10,135,345)
Net operating income, as defined | 22,932,256 | 22,316,767
General and administrative expenses | (5,482,170) | (5,065,579)
Depreciation and amortization | (9,710,265) | (10,256,185)
Interest expense | (12,954,079) | (13,531,337)
Interest income | 30,287 | 85,723
Gain on sale of real estate | 2,623,469 | 2,186,481
Acquisition costs | (72,897) | (145,040)
Income tax expense | (208,681) | (213,860)
Impairment of real estate | 0 | (948,053)
Net loss | (2,842,080) | (5,571,083)
Office/Industrial Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 25,442,638 | 25,564,763
Property and related expenses | (9,284,091) | (8,747,722)
Net operating income, as defined | 16,158,547 | 16,817,041
Model Home Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 3,899,570 | 2,278,832
Property and related expenses | (154,206) | (113,187)
Net operating income, as defined | 3,745,364 | 2,165,645
Retail/Mixed Use Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 4,334,047 | 4,608,517
Property and related expenses | (1,305,702) | (1,274,436)
Net operating income, as defined | $ 3,028,345 | $ 3,334,081

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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