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Allowance for Doubtful Accounts (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2017 property	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) property	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Allowance for Doubtful Accounts
Balance in allowance for doubtful accounts		$ 0		$ 0		$ 0
Bad debt expense		$ 0	$ 0	$ 310,000	$ 190,000
Number of properties relating to bad debt expense | property				4
Number of properties sold | property	1
Percentage of rental income		1.20%	1.20%	1.20%	1.20%
Write-off of unbilled rent receivable				$ 362,000
Write-off of unamortized intangible lease assets				67,000
Write off of tenant origination costs				884,000
Impairment charge on other than ann arbor property				$ 0
Number of properties other than ann arbor property | property				2
Impairment loss		$ 153,000		$ 153,000
Net book value of property		$ 2,382,000		2,382,000
Joe's Crab Shack restaurant Ann Arbor, Michigan
Allowance for Doubtful Accounts
Impairment loss				$ 153,000
Sports Authority Inc.
Allowance for Doubtful Accounts
Bad debt expense					$ 190,000
Maximum | Sports Authority Inc.
Allowance for Doubtful Accounts
Percentage of rental income			1.00%		1.00%

X

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value on other than ann arbor property.

+ References

No definition available.

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- Definition

Number of properties which are occupied by tenant and classified as bad debt.

+ References

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Number of properties which are sold related to bad debt expense.

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- Definition

The number of real estate properties with bad debt expense other than ann arbor property.

+ References

No definition available.

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- Definition

Represent the percentage of the company's rental income accounted by the tenant.

+ References

No definition available.

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- Definition

Represents information pertaining to write-off of tenant origination costs.

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No definition available.

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- Definition

Represents the amount of unamortized intangible lease assets written off during the period.

+ References

No definition available.

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- Definition

Represents the amount of unbilled rent receivable written off during the period.

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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

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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-Paragraph 1
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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
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-Section 45
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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
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-Subparagraph (SX 210.5-03.5)
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The book value of investments in real estate joint ventures including direct and indirect investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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