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Real Estate Acquisitions - Allocation of purchase price (Details) - USD ($)			9 Months Ended
	Oct. 23, 2019	Oct. 03, 2019	Sep. 30, 2019	Sep. 30, 2018
Allocation of purchase price for the Company's real estate acquisitions
Land			$ 6,234,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings And Improvements			31,425,000
Intangible Lease Asset			3,324,000
Intangible Lease Liability			(677,000)
Total			40,306,000
Payment to acquire industrial property on lease			40,306,000	$ 18,452,000
Zwanenberg Food Group/Metro Carpets industrial facility, Nashville, Tennessee
Allocation of purchase price for the Company's real estate acquisitions
Land			1,058,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings And Improvements			6,350,000
Intangible Lease Asset			750,000
Intangible Lease Liability			(81,000)
Total			8,077,000
Echo, Inc. industrial facility, Wauconda, Illinois
Allocation of purchase price for the Company's real estate acquisitions
Land			67,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings And Improvements			3,424,000
Intangible Lease Asset			339,000
Intangible Lease Liability			(4,000)
Total			3,826,000
Tinicum Mechanical Supply/Philly Motors industrial facility, Bensalem, Pennsylvania
Allocation of purchase price for the Company's real estate acquisitions
Land			1,602,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings And Improvements			4,322,000
Intangible Lease Asset			664,000
Intangible Lease Liability			(220,000)
Total			6,368,000
International Flora Technologies industrial facility, Chandler, Arizona
Allocation of purchase price for the Company's real estate acquisitions
Land			1,334,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings And Improvements			7,373,000
Total			8,707,000
Nissan North America industrial facility, LaGrange, Georgia
Allocation of purchase price for the Company's real estate acquisitions
Land			298,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings And Improvements			4,499,000
Intangible Lease Asset			627,000
Intangible Lease Liability			(151,000)
Total			5,273,000
Continental Hydraulics industrial facility, Shakopee, Minnesota
Allocation of purchase price for the Company's real estate acquisitions
Land			1,875,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings And Improvements			5,457,000
Intangible Lease Asset			944,000
Intangible Lease Liability			(221,000)
Total			$ 8,055,000
Industrial property, Rincon, Georgia
Allocation of purchase price for the Company's real estate acquisitions
Payment to acquire industrial property on lease		$ 6,400,000
Industrial property, Chandler, Arizona
Allocation of purchase price for the Company's real estate acquisitions
Payment to acquire industrial property on lease	$ 3,000,000

X

- Definition

Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities and any addition, improvement, or renovation to the structure, for example, but not limited to, interior masonry, interior flooring, electrical, and plumbing, acquired at the acquisition date.

+ References

No definition available.

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The amount of identifiable intangible liabilities recognized as of the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
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Amount of real estate acquired, at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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