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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 and improvements   $
3,191
    $
3,191
 
Buildings and improvements    
28,939
     
28,241
 
Leasehold improvements    
2,553
     
2,759
 
Machinery & Equipment    
58,602
     
54,633
 
Furniture, fixtures, computers & software    
6,820
     
6,419
 
Construction in progress    
6,611
     
1,563
 
    $
106,716
    $
96,806