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Note 12 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Notes Payable, Total $ 4,597,967   $ 4,596,140
Impairment of Real Estate 7,600 $ 1,600  
Fair Value, Inputs, Level 2 [Member]      
Notes Payable, Total 4,400,000   4,600,000
Fair Value, Inputs, Level 3 [Member]      
Notes Payable, Total $ 2,200   $ 1,900