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Note 6 - Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

September 30,

   

December 31,

 
   

2021

   

2020

 
                 

Raw materials

  $ 12,583,000     $ 9,729,000  

Work in process

    2,574,000       2,003,000  

Finished goods

    8,033,000       5,017,000  
    $ 23,190,000     $ 16,749,000