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Sale of Properties (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jun. 20, 2019	Jan. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Sale of Property
Total sales price, net of closing costs					$ 5,314,000	$ 8,958,000
Mortgage loan paid off					1,705,000	$ 9,827,000
Consolidated Joint Venture | Sale of real estate | Retail Property Clemmons, North Carolina | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Sale of Property
Ownership interest in consolidated joint venture of the company (as a percent)	90.00%
Total sales price, net of closing costs	$ 5,314,000
Mortgage loan paid off	$ 1,705,000
Gain on sale of real estate, net			$ 1,099,000		$ 1,099,000
Consolidated Joint Venture | Sale of real estate | Retail Property Clemmons, North Carolina | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Maximum
Sale of Property
Rental revenue percentage from property			1.00%	1.00%	1.00%	1.00%
Consolidated Joint Venture | Sale of real estate | Retail Property Clemmons, North Carolina | Non-Controlling Interests in Consolidated Joint Ventures | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Sale of Property
Non-controlling interest's share of the gain			$ 422,000		$ 422,000
Consolidated Joint Venture | Sale of real estate | Retail Property, Fort Bend, Texas | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Sale of Property
Ownership interest in consolidated joint venture of the company (as a percent)		85.00%
Total sales price, net of closing costs		$ 8,958,000
Gain on sale of real estate, net						$ 2,408,000
Consolidated Joint Venture | Sale of real estate | Retail Property, Fort Bend, Texas | Non-Controlling Interests in Consolidated Joint Ventures | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Sale of Property
Non-controlling interest's share of the gain						$ 776,000

X

- Definition

The parent entity's controlling interest held in a consolidated entity, expressed as a percentage.

+ References

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- Definition

Income (loss) from sale of consolidated JV property attributable to noncontrolling interest.

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The percentage of rental income from property compared to Company's rental income.

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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