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Note 11 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Rent Credit	$ 6,900
Deferred Rent Receivables, Net		$ 17,200	$ 13,600
Operating Lease, Right-of-Use Asset	102,369	99,125
Operating Lease, Liability, Total	$ 96,619	$ 92,711
Operating Lease, Weighted Average Remaining Lease Term (Year)	20 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	6.53%
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset	$ 106,000
Operating Lease, Liability, Total	$ 98,700
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	51 years
Lessee, Operating Lease, Renewal Term (Year)	75 years
Shopping Centers [Member] | Minimum [Member]
Lessor, Operating Lease, Term of Contract (Year)	5 years
Shopping Centers [Member] | Maximum [Member]
Lessor, Operating Lease, Term of Contract (Year)	25 years
Annual Minimum Rentals Plus Incremental Rents [Member] | Rental Revenue [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage	98.00%
Annual Minimum Rentals Plus Incremental Rents [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage		98.00%	98.00%
New Ground Lease [Member]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 8,900
COVID 19 [Member]
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total	81,000
COVID 19 [Member] | Straight-Line Rent Receivables [Member]
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 15,200

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