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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, 2017
Dec. 31, 2016
Fair Value of Derivatives [1] $ 393 $ (4,293)
Fair Value, Inputs, Level 1 [Member]    
Fair Value of Derivatives [1]
Fair Value, Inputs, Level 2 [Member]    
Fair Value of Derivatives [1] 393 (4,293)
Fair Value, Inputs, Level 3 [Member]    
Fair Value of Derivatives [1]
[1] Includes derivative liabilities of $487 and assets of $26 at December 31, 2017 and 2016, respectively.