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Note 3 - Real Estate - Disposition Activity (Details) - Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member] $ in Millions | 6 Months Ended
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Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Aggregate sales price (1) | [1] | $ 17.2 | $ 110.1
Gain on sale of properties |  | $ 5.7 | $ 38.4
Number of properties sold |  | 3 | 7
Number of out-parcels sold |  | 0 | 5
[1] | During the six months ended June 30, 2020, the Company held in escrow an aggregate of $3.2 million of net proceeds in connection with these sales associated with a reverse exchange in accordance with Internal Revenue Code 26 U.S.C.1031, which was returned to the Company in July 2020.

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