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Note 3 - Inventories
3 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Inventory Disclosure [Text Block]

3.

Inventories

 

Inventories consist of the following (in thousands):

 

  

March 31,

2021

  

December 31,

2020

 
         

Raw materials

 $24,570  $20,631 

Work-in-process

  1,076   1,416 

Finished goods

  5,799   5,489 

Supplies

  1,732   1,641 

Total inventories

 $33,177  $29,177