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Note 3 - Property Acquisitions, Developments and Other Investments (Details Textual) ft² in Millions, $ in Millions		12 Months Ended
	Sep. 20, 2017 USD ($) ft²	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Proceeds from Delayed Tax Exempt Exchange		$ 162.4	$ 66.0
Business Acquisition, Percentage of Voting Interests Acquired		54.27%
Real Estate Revenue From Acquisitions During Period		$ 31.0	$ 23.8	$ 112.2
PUERTO RICO
Number of Real Estate Properties	7	7
Area of Real Estate Property | ft²	2.2
Property Insurance, Coverage	$ 62.0
Business Interruption Insurance, Coverage	39.3
Insurance, Deductible	$ 1.2
PUERTO RICO | Hurricane [Member]
Real Estate Investment Properties, Write-offs		$ 16.0
Insurance Settlements Receivable		16.0
Estimated Insurance Recoveries		26.0
Proceeds from Insurance Settlement, Investing Activities		4.0
Unusual or Infrequent Item, or Both, Loss, Gross		3.4
Proceeds from Insurance Settlement, Operating Activities		1.6
PUERTO RICO | Hurricane [Member] | Other Assets [Member]
Insurance Settlements Receivable		$ 12.0

X

- Definition

The monetary amount of business interruption insurance coverage.

+ References

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Amount of risk retained by the entity before the insurance arrangement begins to provide coverage.

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The monetary amount of property covered under a property insurance policy.

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- Definition

The amount of real estate investment properties written off during the reporting period.

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- Definition

The amount of real estate revenue derived from properties acquired during the period and is included in the company's income statement.

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- Definition

Area of a real estate property.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
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Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

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The number of real estate properties owned as of the balance sheet date.

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- Definition

Cash inflow related to a property which is traded for the promise to provide a replacement like-kind property in the near future also known as a tax deferred exempt exchange.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities.

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Amount of cash inflow for proceeds from settlement of insurance claim, classified as operating activities. Excludes insurance settlement classified as investing activities.

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Amount, before deduction of insurance proceeds, of loss recognized in the income statement for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

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-Publisher FASB
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