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Note 3 - Property Acquisitions, Developments and Other Investments - Previous Ownership Interest and Gain on Change of Interest (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Gain on change in control of interests, net | $ 57.4 | $ 149.2
Oakwood Plaza North [Member] |  |
Previous ownership interest | 55.00% |
Gain on change in control of interests, net | $ 46.5 |
Elmont Plaza [Member] |  |
Previous ownership interest |  | 50.00%
Gain on change in control of interests, net |  | $ (0.2)
Gateway Plaza [Member] |  |
Previous ownership interest | 15.00% |
Gain on change in control of interests, net |  |
Kimstone [Member] |  |
Previous ownership interest |  | 33.30%
Gain on change in control of interests, net |  | $ 140.0
GEPT Portfolio [Member] |  |
Previous ownership interest | 15.00% |
Gain on change in control of interests, net | $ 6.6 |
Montgomery Plaza [Member] |  |
Previous ownership interest |  | 20.00%
Gain on change in control of interests, net |  | $ 6.3
Kim Pru [Member] |  |
Previous ownership interest | 15.00% |
Gain on change in control of interests, net | $ 0.8 |
Conroe Marketplace [Member] |  |
Previous ownership interest |  | 15.00%
Gain on change in control of interests, net |  | $ 2.4
Hamden Mart [Member] |  |
Previous ownership interest | 47.95% |
Gain on change in control of interests, net | $ 3.5 |
Shops at District Heights [Member] |  |
Previous ownership interest |  | 15.00%
Gain on change in control of interests, net |  | $ 0.7

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- 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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- 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=65885119&loc=d3e1392-128463 + Details
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