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Note 4 - Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule Of Derivative Assets (Liabilities) at Fair Value [Table Text Block]
   
December 31
,
201
7
    
December
31,
201
6
  
Commodity contracts
   $
107
     $
623
  
Foreign currency contracts
    
167
      
(150
 )
Interest rate swaps
    
4,356
      
(1,739
 )