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Note 3 - Investments and Advances in Real Estate Joint Ventures (Details Textual) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2013 USD ($)
Kim Pru and Kim Pru II [Member] |  |  |  |
Number of Joint Ventures |  | 4 |  |
Number Of Accounts |  | 4 |  |
Kim Pru [Member] |  |  |  |
Number of Joint Ventures |  | 3 |  |
Intown [Member] |  |  |  |
Deferred Gain on Sale of Property |  |  |  | $ 21.7
Gains (Losses) on Sales of Investment Real Estate |  |  | $ 21.7 |
Other Joint Venture Programs [Member] | Partially Owned Properties [Member] | Corporate Joint Venture [Member] |  |  |  |
Impairment of Real Estate |  |  | 2.6 |
Other Joint Venture Programs [Member] | Partially Owned Properties [Member] |  |  |  |
Impairment of Real Estate |  |  | 1.3 |
Subsequent Event [Member] | CPP [Member] | Mortgages [Member] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $ 100.0 |  |  |
Subsequent Event [Member] | CPP [Member] |  |  |  |
Business Combination, Consideration Transferred | $ 299.2 |  |  |
Subsequent Event [Member] |  |  |  |
Number of Operating Property Acquired | 1 |  |  |
Number of Development Project Acquired | 1 |  |  |
Equity in Income of Joint Ventures, Net [Member] |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  | $ 54.1 | $ 53.4 |
Gains (Losses) on Sales of Investment Real Estate |  | $ 26.9 |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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