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Note 5 - Inventories (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

March 31,

   

December 31,

 
   

2023

   

2022

 
                 

Raw materials

  $ 12,220,000     $ 13,018,000  

Work in process

    3,013,000       2,225,000  

Finished goods

    8,861,000       9,154,000  
    $ 24,094,000     $ 24,397,000