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Segments (Net Operating Income by Segment) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Net Operating Income [Abstract] |  |  |  |
Rental income | $ 7,794,585 | $ 7,658,273 | $ 15,809,218 | $ 15,909,341
Property and related expenses | (2,636,063) | (2,585,013) | (5,273,165) | (5,058,364)
Net operating income, as defined | 5,882,011 | 5,221,261 | 11,491,436 | 11,179,927
General and administrative expenses | (1,439,820) | (1,232,319) | (2,629,837) | (2,462,730)
Depreciation and amortization | (2,443,817) | (2,499,630) | (4,947,333) | (5,159,161)
Interest expense | (3,311,421) | (3,501,199) | (6,627,617) | (6,864,243)
Interest income | 5,829 | 46,593 | 15,097 | 68,332
Income tax expense | (13,746) | (76,152) | (108,356) | (144,700)
Gain on sale of real estate | 1,485,589 | 1,213,060 | 2,027,051 | 1,388,545
Net income (loss) | 164,625 | (828,386) | (779,559) | (1,994,030)
Office/Industrial Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income | 6,535,722 | 6,200,968 | 12,779,101 | 13,194,587
Property and related expenses | (2,295,720) | (2,140,237) | (4,514,238) | (4,373,491)
Net operating income, as defined | 4,240,002 | 4,060,731 | 8,264,864 | 8,821,096
Residential Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income | 930,062 | 567,281 | 1,806,607 | 955,681
Property and related expenses | (35,038) | (61,376) | (73,995) | (78,416)
Net operating income, as defined | 895,024 | 505,905 | 1,732,612 | 877,265
Retail/Mixed Use Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income | 1,052,289 | 1,038,025 | 2,178,893 | 2,088,023
Property and related expenses | (305,304) | (383,400) | (684,933) | (606,457)
Net operating income, as defined | $ 746,985 | $ 654,625 | $ 1,493,960 | $ 1,481,566

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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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