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Note 3 - Exit and Disposal Activities (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Restructuring and Related Costs [Table Text Block]
   
 
 
 
  
Recognized
    
Remaining
  
   
Total
   
as of
   
Costs to be
  
   
Program
    
December 31, 2017
    
Recognized
  
                         
Severance and benefit-related costs
   $
1,363
     $
1,363
     $
0
  
Asset impairments
    
188
      
188
      
0
  
Equipment relocation costs
    
1,536
      
1,424
      
112
  
Other
    
530
      
30
      
500
  
    $
3,617
     $
3,005
     $
612
  
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
   
Accrued
   
 
 
 
  
Cash
    
Accrued
  
   
Balance at
    
 
 
 
  
Payments
    
Balance at
  
   
Dec. 31,
    
2017
    
or Asset
    
Dec. 31,
  
   
2016
    
Charge
    
Write-Offs
    
2017
  
Severance and benefit related costs
   $
427
     $
936
     $
(1,218
 )   $
145
  
Equipment relocation costs
    
0
      
1,424
      
(1,424
 )    
0
  
    $
427
     $
2,360
     $
(2,642
 )   $
145
  
Disposal Groups, Including Discontinued Operations [Table Text Block]
   
December 31,
  
   
2017
    
2016
  
Property, plant and equipment
   $
28,874
     $
6,673
  
Accumulated depreciation
    
(25,976
 )    
(5,841
 )
Property, plant and equipment, net   $
2,898
     $
832