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Note 8 - Fair Value of Financial Instruments - Carrying Amount and Fair Value of Mortgage Notes Payable (Details) - Mortgages [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Reported Value Measurement [Member]    
Mortgage notes payable $ 974,197 $ 925,613
Estimate of Fair Value Measurement [Member]    
Mortgage notes payable $ 1,019,601 $ 927,561