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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Operating Lease, Right-of-Use Asset |  | $ 104,177,000 |  |
Operating Lease, Liability, Total |  | 97,133,000 |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  | 106,000,000 | $ 106,000,000 |
Intangible Assets, Net (Excluding Goodwill), Total |  | 7,300,000 |  |
Operating Lease, Liability, Total |  | $ 98,700,000 | $ 98.70 |
Reclassification of Reimbursement Income From Revenues From Rental Properties for Three Months Ended Mar. 31, 2018[Member] |  |  |  |
Prior Period Reclassification Adjustment | $ 63,700,000 |  |  |
Other Rental Property for Three Months Ended Mar. 31, 2018 [Member] |  |  |  |
Prior Period Reclassification Adjustment | $ 5,600,000 |  |  |

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