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Note 4 - Inventories
6 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Inventory Disclosure [Text Block]
4.
Inventories
 
Inventories consist of the following (in thousands):
 
   
June 30,
2019
   
December 31,
2018
 
 
               
Raw materials
  $
29,564
    $
34,426
 
Work-in-process
   
1,515
     
2,368
 
Finished goods
   
915
     
1,075
 
Supplies
   
1,519
     
1,507
 
Total inventories
  $
33,513
    $
39,376