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Note 3 - Property Acquisitions, Developments and Other Investments - Previous Ownership Interest and Gain on Change of Interest (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Gain on change in control of interests, net		$ 71,160	$ 57,386,000
Plantation Commons [Member]
Previous ownership interest		76.25%
Gain on change in control of interests, net		$ 9,793
Oakwood Plaza North [Member]
Previous ownership interest			55.00%
Gain on change in control of interests, net			$ 46,512,000
Gateway Plaza [Member]
Previous ownership interest			15.00%
Gain on change in control of interests, net
Gordon Plaza [Member]
Previous ownership interest		40.62%
Gain on change in control of interests, net		$ 395
GEPT Portfolio [Member]
Previous ownership interest			15.00%
Gain on change in control of interests, net			$ 6,583,000
The District at Tustin Legacy [Member]
Previous ownership interest	[1]
Gain on change in control of interests, net		$ 60,972
Kim Pru [Member]
Previous ownership interest			15.00%
Gain on change in control of interests, net			$ 832,000
Hamden Mart [Member]
Previous ownership interest			47.95%
Gain on change in control of interests, net			$ 3,459,000
[1] The Company's share of this investment is subject to change and is based upon a cash flow waterfall provision within the partnership agreement (54.27% as of date of consolidation).

X

- Definition

Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

In a business combination achieved in stages, this element represents the amount of net gain (loss) 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://www.xbrl.org/2003/role/presentationRef
-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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- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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