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Real Estate Acquisitions - Allocation of purchase price (Details) - USD ($) |  |  | 9 Months Ended
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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 |  |  |

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- 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. + Details
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- Definition The amount of identifiable intangible liabilities recognized as of the acquisition date. + References No definition available. + Details
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- Definition 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 -URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + 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 -URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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