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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Jan. 01, 2018
Contract with Customer, Liability, Total |  | $ 0 | $ 0 |  |  |  |
Revenues, Total |  |  | 304,078 | $ 293,588 |  |  |
Disposal Group, Deferred Gain on Disposal |  |  |  |  | $ 8,100 |  |
Contract with Customer, Asset, Net, Total |  | 0 | 0 |  |  |  |
Other Rental Property Income [Member] |  |  |  |  |  |  |
Revenues, Total |  |  | 5,586 | $ 3,551 |  |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax, Total |  |  |  |  | 1,100 |  |
Investments in and Advances to Real Estate Joint Ventures [Member] |  |  |  |  |  |  |
Disposal Group, Deferred Gain on Disposal |  |  |  |  | 6,900 |  |
Other Liabilities [Member] |  |  |  |  |  |  |
Disposal Group, Deferred Gain on Disposal |  |  |  |  | 1,200 |  |
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | (1,136) | [1] | $ (1,100)
Accounting Standards Update 2017-05 [Member] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | [1] |  |  |  | 8,098 |  |
Accounting Standards Update 2017-05 [Member] | Gain on Sale of Operating Properties/ Change in Controls of Interests [Member] |  |  |  |  |  |  |
Deconsolidation, Gain (Loss), Amount |  | $ 6,800 | 6,800 |  |  |  |
Accounting Standards Update 2017-05 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 8,098 | [1] | $ 8,100
Three Months Ended March 31, 2017 [Member] | Reclassification of Reimbursement Income From Revenues From Rental Properties [Member] |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | 58,100 |  |  |  |
Three Months Ended March 31, 2017 [Member] | Reclassification of Other Rental Property Income From Revenues From Properties [Member] |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  | $ 3,600 |  |
Reclassification of Personnel Costs Related to Property Management and Services From General Administrative to Operating and Maintenance [Member] | Three Months Ended March 31, 2017 [Member] |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | $ 8,300 |  |  |  |
[1] | Represents the impact of change in accounting policies for its respective Accounting Standard Updates ("ASU"). See Footnote 2 of the Notes to Condensed Consolidated Financial Statements for additional disclosure.

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