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Note 4 - Inventory (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

September 30, 2025

   

December 31, 2024

 

At average cost (approximates current cost)

               

Finished goods

  $ 1,880     $ 10,809  

Work in process

    601       872  

Raw materials

    6,133       15,335  
      8,614       27,016  

LIFO reserve

    (2,481 )     (6,373 )

Total inventory

  $ 6,133     $ 20,643