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Note 4 - Fair Value of Derivatives (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Commodity Contract [Member]    
Fair Value of Derivates $ (400) $ (515)
Foreign Exchange Contract [Member]    
Fair Value of Derivates (171) (149)
Interest Rate Swap [Member]    
Fair Value of Derivates $ (2,618) $ (1,045)