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Segments (Assets) (Detail) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Land, buildings and improvements, net |  | $ 238,595,388 | $ 246,969,993 |  | $ 239,948,063 |
Total Assets |  | 254,079,359 | 257,999,077 |  | 254,274,393 |
Cash and cash equivalents |  | 5,847,369 | 3,116,147 | $ 5,518,204 | 6,626,423 | $ 5,636,002
Other assets, net |  | 5,451,230 | 5,745,982 |  | 5,895,991 |
Significant Reconciling Items [Member] |  |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Other assets, net |  | 9,636,602 | 7,912,937 |  | 7,699,907 |
Office/Industrial Properties [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Land, buildings and improvements, net | [1] | 162,357,260 | 172,309,537 |  | 178,776,776 |
Total Assets | [2] | 166,648,955 | 175,689,722 |  | 188,805,090 |
Residential Properties [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Land, buildings and improvements, net | [1] | 38,280,020 | 34,813,680 |  | 16,888,267 |
Total Assets | [2] | 39,265,806 | 35,960,179 |  | 14,395,904 |
Retail Properties [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Land, buildings and improvements, net | [1] | 31,893,613 | 33,398,992 |  | 35,395,235 |
Total Assets | [2] | $ 32,680,626 | $ 35,320,092 |  | $ 36,747,069 |
[1] | Includes lease intangibles and the land purchase option related to property acquisitions.
[2] | Includes land, buildings and improvements, current receivables, deferred rent receivables and deferred leasing costs and other related intangible assets, all shown on a net basis.

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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