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Note 3 - Property Acquisitions, Developments and Other Investments (Details Textual) ft² in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 20, 2017 USD ($) ft² | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Proceeds from Delayed Tax Exempt Exchange |  | $ 162.4 | $ 66.0 |
Business Acquisition, Percentage of Voting Interests Acquired |  | 54.27% |  |
Real Estate Revenue From Acquisitions During Period |  | $ 31.0 | $ 23.8 | $ 112.2
PUERTO RICO |  |  |  |
Number of Real Estate Properties | 7 | 7 |  |
Area of Real Estate Property | ft² | 2.2 |  |  |
Property Insurance, Coverage | $ 62.0 |  |  |
Business Interruption Insurance, Coverage | 39.3 |  |  |
Insurance, Deductible | $ 1.2 |  |  |
PUERTO RICO | Hurricane [Member] |  |  |  |
Real Estate Investment Properties, Write-offs |  | $ 16.0 |  |
Insurance Settlements Receivable |  | 16.0 |  |
Estimated Insurance Recoveries |  | 26.0 |  |
Proceeds from Insurance Settlement, Investing Activities |  | 4.0 |  |
Unusual or Infrequent Item, or Both, Loss, Gross |  | 3.4 |  |
Proceeds from Insurance Settlement, Operating Activities |  | 1.6 |  |
PUERTO RICO | Hurricane [Member] | Other Assets [Member] |  |  |  |
Insurance Settlements Receivable |  | $ 12.0 |  |

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