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Note 3 - Inventories (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

December 31,

 
   

2022

   

2021

 
                 

Raw materials

  $ 13,018,000     $ 13,545,000  

Work in process

    2,225,000       3,890,000  

Finished goods

    9,154,000       7,534,000  

Total inventory

  $ 24,397,000     $ 24,969,000