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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

December 31,

 
  

2021

  

2020

 
         

Raw materials

 $13,545,000  $9,729,000 

Work in process

  3,890,000   2,003,000 

Finished goods

  7,534,000   5,017,000 

Total inventory

 $24,969,000  $16,749,000