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Note 5 - Inventories (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

September 30,

   

December 31,

 
   

2023

   

2022

 
                 

Raw materials

  $ 11,220,000     $ 13,018,000  

Work in process

    2,594,000       2,225,000  

Finished goods

    7,712,000       9,154,000  
    $ 21,526,000     $ 24,397,000