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Note 4 - Inventory (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

March 31, 2022

  

December 31, 2021

 

At average cost (approximates current cost)

        

Finished goods

 $35,741  $12,132 

Work in process

  931   462 

Raw materials and supplies

  16,256   30,117 
   52,928   42,711 

LIFO reserve

  (15,308)  (15,791)

Total inventory

 $37,620  $26,920