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Note 3 - Inventories
9 Months Ended
Sep. 30, 2020
Notes to Financial Statements  
Inventory Disclosure [Text Block]

3.

Inventories

 

Inventories consist of the following (in thousands):

 

   

September 30, 2020

   

December 31, 2019

 
                 

Raw materials

  $ 23,960     $ 26,772  

Work-in-process

    1,215       1,579  

Finished goods

    5,197       683  

Supplies

    1,573       1,620  

Total inventories

  $ 31,945     $ 30,654