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Note 10 - Noncontrolling Interests (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Payments to Noncontrolling Interests $ 2,700 $ 3,400
Adjustments to Additional Paid in Capital, Other 500 1,200
Noncontrolling Interest, Change in Redemption Value [1] 0 3,918
Gain on Sale of Operating Properties/ Change in Controls of Interests [Member] | Accounting Standards Update 2017-05 [Member]    
Deconsolidation, Gain (Loss), Amount   6,800
Sold Portion of Investment in Consolidated Operating Property [Member]    
Noncontrolling Interest, Decrease from Deconsolidation   43,800
Land Parcel Adjacent to Shopping Center Located in Ardmore, PA [Member]    
Disposal Group, Including Discontinued Operation, Consideration   320,000
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member]    
Debt Instrument, Increase (Decrease), Net, Total   206,000
Noncontrolling Interest [Member]    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests $ 3,200 $ 4,600
[1] During the nine months ended September 30, 2018, the Company recorded an adjustment of $3.9 million to the estimated redemption fair market value of a noncontrolling interest in accordance with the provisions of the respective joint venture agreement and ASC 480 - Accounting for Redeemable Equity Instruments.