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Note 12 - Leases (Details Textual)
$ in Thousands
12 Months Ended
Aug. 03, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Difference Between Rental Income Contracted and Rental Income Recognized   $ 20,800 $ (6,900) $ 17,200
Weingarten Realty Investors [Member]        
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 32,600 32,569 0 0
Number of Properties Associated with Operating Leases Obtained in Business Acquisition 6      
Number of Properties Associated with Finance Leases Obtained in Business Acquisition 2      
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 23,000 $ 23,026 $ 0 $ 0
Maximum [Member]        
Lessee, Operating Lease, Remaining Lease Term (Year)   64 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% 98.00% 98.00%