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Note 9 - Fair Value of Financial Instruments - Carrying Amount and Fair Value of Mortgage Notes Payable (Details) - Mortgages [Member] - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Reported Value Measurement [Member]    
Mortgage notes payable $ 764,348 $ 764,593
Estimate of Fair Value Measurement [Member]    
Mortgage notes payable $ 751,016 $ 749,324