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Note 3 - Property Acquisitions, Developments and Other Investments - Purchase Price Allocation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Allocation	$ (8,521)	$ (4,292)
Allocation adjustments (Year)	1 year 109 days	4 years 36 days
Allocation	$ 8,342
Allocation adjustments (Year)	19 years
Allocation	$ 5,090	$ 234
Allocation	(3,951)	(27)
Allocation	688,326	645,624
Tenant Improvements [Member]
Allocation	$ 14,520	$ 11,633
Allocation adjustments (Year)	7 years 73 days	7 years 36 days
Leases, Acquired-in-Place [Member]
Allocation	$ 56,200	$ 43,031
Allocation adjustments (Year)	7 years 73 days	6 years 146 days
Above Market Leases [Member]
Allocation	$ 12,197	$ 12,867
Allocation adjustments (Year)	7 years 292 days	8 years 36 days
Below Market Leases [Member]
Allocation	$ (77,027)	$ (36,619)
Allocation adjustments (Year)	29 years 182 days	19 years 36 days
Preliminary Allocation [Member]
Allocation		$ (4,292)
Allocation		234
Allocation		(27)
Allocation		645,624
Preliminary Allocation [Member] | Tenant Improvements [Member]
Allocation		12,788
Preliminary Allocation [Member] | Leases, Acquired-in-Place [Member]
Allocation		44,094
Preliminary Allocation [Member] | Above Market Leases [Member]
Allocation		11,982
Preliminary Allocation [Member] | Below Market Leases [Member]
Allocation		(31,903)
Allocation Adjustments [Member]
Allocation adjustments
Allocation Adjustments [Member] | Tenant Improvements [Member]
Allocation adjustments		(1,155)
Allocation Adjustments [Member] | Leases, Acquired-in-Place [Member]
Allocation adjustments		(1,063)
Allocation Adjustments [Member] | Above Market Leases [Member]
Allocation adjustments		885
Allocation Adjustments [Member] | Below Market Leases [Member]
Allocation adjustments		(4,716)
Land [Member]
Allocation	$ 255,715	174,000
Land [Member] | Preliminary Allocation [Member]
Allocation		179,150
Land [Member] | Allocation Adjustments [Member]
Allocation adjustments		(5,150)
Building [Member]
Allocation	$ 379,148	$ 278,797
Allocation adjustments (Year)	50 years	50 years
Building [Member] | Preliminary Allocation [Member]
Allocation		$ 309,493
Building [Member] | Allocation Adjustments [Member]
Allocation adjustments		(30,696)
Building Improvements [Member]
Allocation	$ 46,613	$ 166,000
Allocation adjustments (Year)	41 years 182 days	45 years
Building Improvements [Member] | Preliminary Allocation [Member]
Allocation		$ 124,105
Building Improvements [Member] | Allocation Adjustments [Member]
Allocation adjustments		$ 41,895

X

- Definition

Weighted average amortization period of finite-lived intangible liabilities acquired either individually or as part of a group of liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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X

- Definition

The fair value debt adjustments resulting from the business acquisition.

+ References

No definition available.

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- Definition

The weighted average amortization period of fair value debt resulting from the business acquisition.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

The weighted-average amortization period of assets and liabilities recognized as of the acquisition date.

+ References

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- Definition

The amount of tax increment financings which have been recognized as of the acquisition date.

+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial liabilities assumed in connection with a business combination for which the initial accounting was incomplete.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
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- Definition

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- Definition

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+ References

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-Publisher FASB
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- Definition

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

+ References

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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- Definition

Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

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