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Note 6 - Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
 
   
2017
    
2016
  
                 
Land
   $
6,911
     $
4,268
  
Buildings and improvements
    
129,065
      
131,794
  
Machinery and equipment
    
451,882
      
377,990
  
Furniture and fixtures
    
2,850
      
1,995
  
Construction in progress
    
34,400
      
24,102
  
Total
    
625,108
      
540,149
  
Accumulated depreciation
    
(370,809
 )    
(323,057
 )
Net
   $
254,299
     $
217,092