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Note 3 - Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 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
  
August 9, 2017
  
July 1, 2018
   $
125,000
      
1.6298%
  
July 1, 2019
Interest Rate
  
August 9, 2017
  
July 1, 2019
    
125,000
      
1.8598%
  
July 1, 2020
Interest Rate
  
August 9, 2017
  
July 1, 2020
    
125,000
      
2.0848%
  
July 1, 2021
Interest Rate
  
August 9, 2017
  
July 1, 2021
    
125,000
      
2.3010%
  
July 1, 2022
Interest Rate
  
August 9, 2017
  
July 1, 2022
    
125,000
      
2.4848%
  
May 31, 2023
Interest Rate
  
August 30, 2017
  
July 1, 2018
    
125,000
      
1.5503%
  
July 1, 2019
Interest Rate
  
August 30, 2017
  
July 1, 2019
    
125,000
      
1.7553%
  
July 1, 2020
Interest Rate
  
August 30, 2017
  
July 1, 2020
    
125,000
      
1.9803%
  
July 1, 2021
Interest Rate
  
August 30, 2017
  
July 1, 2021
    
125,000
      
2.2228%
  
July 1, 2022
Interest Rate
  
August 30, 2017
  
July 1, 2022
    
125,000
      
2.4153%
  
May 31, 2023
Schedule Of Derivative Assets (Liabilities) at Fair Value [Table Text Block]
   
September
30
,
201
7
    
December
31,
201
6
  
Commodity contracts
   $
364
     $
623
  
Foreign currency contracts
    
1,257
      
(150
 )
Interest rate swaps
    
469
      
(1,739
 )