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Note 5 - Inventories (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

September 30,

   

December 31,

 
   

2022

   

2021

 
                 

Raw materials

  $ 12,817,000     $ 13,545,000  

Work in process

    3,292,000       3,890,000  

Finished goods

    9,015,000       7,534,000  
    $ 25,124,000     $ 24,969,000