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Note 3 - Property Acquisitions, Developments and Other Investments (Details Textual) ft² in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 20, 2017 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Payments to Acquire Real Estate, Total |  | $ 5,407,000 | $ 153,854,000 | $ 203,190,000
Proceeds from Delayed Tax Exempt Exchange |  |  | $ 162,400,000 |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 54.27% |
Real Estate Revenue From Acquisitions During Period |  | 0 | $ 31,000,000 | 23,800,000
Proceeds from Insurance Settlement, Investing Activities |  | $ 16,222,000 |  |
PUERTO RICO |  |  |  |
Number of Real Estate Properties | 7 | 7 |  |
Area of Real Estate Property | ft² | 2.2 |  |  |
Property Insurance, Coverage | $ 62,000,000 |  |  |
Business Interruption Insurance, Coverage | 39,300,000 |  |  |
Insurance, Deductible | $ 1,200,000 |  |  |
PUERTO RICO | Hurricane [Member] |  |  |  |
Estimated Insurance Recoveries |  | $ 30,300,000 |  |
Proceeds from Insurance Settlement, Investing Activities |  | 20,200,000 | 4,200,000 |
Real Estate Investment Properties, Write-offs |  |  | 16,000,000 |
Proceeds from Insurance Settlement, Operating Activities |  | $ 2,800,000 | $ 1,600,000 |
Land Parcels Adjacent to Shopping Center Located in Ardmore, PA and Elmont, NY [Member] |  |  |  |
Number of Land Parcels Acquired |  | 2 |  |
Payments to Acquire Real Estate, Total |  | $ 5,400,000 |  |

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