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Note 3 - Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Hedged Item
  
Contract Date
  
Effective Date
  
Notional Amount
    
Fixed LIBOR Rate
    
Expiration Date
                             
Interest Rate
  
June 19, 2017
  
July 2, 2018
   $
125,000
      
1.6543%
    
July 1, 2019
Interest Rate
  
June 19, 2017
  
July 1, 2019
    
125,000
      
1.9053%
    
July 1, 2020
Interest Rate
  
June 19, 2017
  
July 1, 2020
    
125,000
      
2.1328%
    
July 1, 2021
Interest Rate
  
June 19, 2017
  
July 1, 2021
    
125,000
      
2.3453%
    
July 1, 2022
Interest Rate
  
June 19, 2017
  
July 1, 2022
    
125,000
      
2.4828%
    
May 31, 2023
Interest Rate
  
June 30, 2017
  
July 2, 2018
    
125,000
      
1.7090%
    
July 1, 2019
Interest Rate
  
June 30, 2017
  
July 1, 2019
    
125,000
      
1.9750%
    
July 1, 2020
Interest Rate
  
June 30, 2017
  
July 1, 2020
    
125,000
      
2.2170%
    
July 1, 2021
Interest Rate
  
June 30, 2017
  
July 1, 2021
    
125,000
      
2.4360%
    
July 1, 2022
Interest Rate
  
June 30, 2017
  
July 1, 2022
    
125,000
      
2.5910%
    
May 31, 2023
Schedule Of Derivative Assets (Liabilities) at Fair Value [Table Text Block]
   
June 30
,
201
7
    
December
31,
201
6
  
Commodity contracts
   $
432
     $
623
  
Foreign currency contracts
    
267
      
(150
 )
Interest rate swaps
    
(493
 )    
(1,739
 )