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Note 3 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value of Derivatives [2] $ (4,293) [1] $ (28,434)
Fair Value, Inputs, Level 1 [Member]    
Fair Value of Derivatives [2]
Fair Value, Inputs, Level 2 [Member]    
Fair Value of Derivatives [2] (4,293) (28,434)
Fair Value, Inputs, Level 3 [Member]    
Fair Value of Derivatives [2]
[1] Includes derivative assets of $26 at December 31, 2016.
[2] No cash collateral was provided by the Company at December 31, 2016 and 2015.