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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, 2019
Dec. 31, 2018
Commodity Contract [Member]    
Fair Value of Derivatives $ 0 $ (160)
Foreign Exchange Contract [Member]    
Fair Value of Derivatives (221) (117)
Interest Rate Swap [Member]    
Fair Value of Derivatives $ 1,383 $ 8,307