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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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