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Note 10 - Noncontrolling Interests (Details Textual) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Payments to Noncontrolling Interests | $ 2.7 | $ 3.4
Adjustments to Additional Paid in Capital, Other | 0.5 | 1.2
Gain on Sale of Operating Properties/ Change in Controls of Interests [Member] | Accounting Standards Update 2017-05 [Member] |  |
Deconsolidation, Gain (Loss), Amount |  | 6.8
Sold Portion of Investment in Consolidated Operating Property [Member] |  |
Noncontrolling Interest, Decrease from Deconsolidation |  | 43.8
Land Parcel Adjacent to Shopping Center Located in Ardmore, PA [Member] |  |
Disposal Group, Including Discontinued Operation, Consideration |  | 320.0
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member] |  |
Debt Instrument, Increase (Decrease), Net, Total |  | 206.0
Noncontrolling Interest [Member] |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | $ 3.2 | $ 4.6

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