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Note 3 - Inventories
3 Months Ended
Mar. 31, 2022
Notes to Financial Statements  
Inventory Disclosure [Text Block]

3.

Inventories

 

Inventories consist of the following (in thousands):

 

   

March 31, 2022

   

December 31, 2021

 
                 

Raw materials

  $ 47,297     $ 44,697  

Work-in-process

    2,905       3,018  

Finished goods

    10,620       10,096  

Supplies

    1,886       1,840  

Total inventories

  $ 62,708     $ 59,651