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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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