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Note 4 - Derivative Instruments and Hedging Activities - Fair Value of Derivatives (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Commodity Contract [Member]    
Fair Value of Derivatives $ (163) $ 107
Foreign Exchange Contract [Member]    
Fair Value of Derivatives (25) 167
Interest Rate Swap [Member]    
Fair Value of Derivatives $ 13,339 $ 4,356