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Segments (Assets) (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net |  | $ 211,712,230 | $ 220,186,759 |  |
Cash equivalents and restricted cash |  | 12,839,227 | 9,776,215 | $ 6,101,402 | $ 8,310,575
Other assets, net |  | 5,555,299 | 7,646,207 |  |
TOTAL ASSETS |  | 225,066,224 | 233,050,040 |  |
Significant Reconciling Items [Member] |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |
Other assets, net |  | 514,767 | 3,087,066 |  |
Office/Industrial Properties [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | [1] | 133,923,477 | 138,694,773 |  |
TOTAL ASSETS | [2] | 138,049,968 | 143,620,315 |  |
Model Home Properties [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | [1] | 43,624,148 | 48,762,869 |  |
TOTAL ASSETS | [2] | 47,453,048 | 48,864,060 |  |
Retail/Mixed Use Properties [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | [1] | 24,658,611 | 23,650,423 |  |
TOTAL ASSETS | [2] | $ 26,209,214 | $ 27,702,384 |  |
[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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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