Note 10 - Fair Value Measurements - Fair Value of Liabilities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Reported Value Measurement [Member]
Mortgage notes payable	$ 1,473,166
Total	1,473,166
Estimate of Fair Value Measurement [Member]
Mortgage notes payable	1,461,943
Total	$ 1,461,943

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant