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Note 7 - Fair Value of Financial Instruments - Carrying Amount and Fair Value of Mortgage Notes Payable (Details) - Mortgages [Member] - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Reported Value Measurement [Member]    
Mortgage notes payable $ 1,151,115 $ 1,144,052
Estimate of Fair Value Measurement [Member]    
Mortgage notes payable $ 1,138,150 $ 1,199,409