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Note 5 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value of Derivatives [1] $ (5,885) $ (4,293)
Fair Value, Inputs, Level 1 [Member]    
Fair Value of Derivatives
Fair Value, Inputs, Level 2 [Member]    
Fair Value of Derivatives (5,885) (4,293)
Fair Value, Inputs, Level 3 [Member]    
Fair Value of Derivatives
[1] Includes derivative assets of $56 at March 31, 2017 and $26 at December 31, 2016.