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Note 6 - Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Property, Plant, and Equipment Components [Table Text Block]
    December 31,
    2016   2015
Land and improvements   $
3,191
     $
3,191
  
Buildings and improvements    
28,241
      
25,399
  
Leasehold improvements    
2,759
      
2,839
  
Machinery & Equipment    
54,633
      
51,016
  
Furniture, fixtures, computers & software    
6,419
      
6,498
  
Construction in progress–equipment    
1,563
      
1,621
  
    $
96,806
     $
90,564