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

Inventories consist of:

        
  

2021

  

2020

 
         

Raw materials

 $1,030,955  $928,221 

Work-in-process

  194,060   195,618 

Inventories

 $1,225,015  $1,123,839