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Note 3 - Derivative Instruments and Hedging Activities - Fair Value of Derivatives (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Commodity Contract [Member]    
Fair Value of Derivates $ 48 $ (400)
Foreign Exchange Contract [Member]    
Fair Value of Derivates 417 (171)
Interest Rate Swap [Member]    
Fair Value of Derivates $ (3,454) $ (2,618)