Note 3 - Property Acquisitions, Developments and Other Investments (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Proceeds from Delayed Tax Exempt Exchange	$ 36,100
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	0	$ 0	$ 71,160
Real Estate Revenue From Acquisitions During Period	$ 1,400	$ 0	$ 31,000
Land Parcels Adjacent to Shopping Center Located in Ardmore, PA and Elmont, NY [Member]
Number of Land Parcels Acquired		2
Payments to Acquire Real Estate, Total		$ 5,400
Linwood Square [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	69.50%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 100

The number of land parcels acquired over a certain period of time.

No definition available.

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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.

+ References

No definition available.

+ Details

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- Definition

In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ 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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- 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

+ Details

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Balance Type:	debit
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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685

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- Details

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- Details

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