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Note 5 - Inventories, Net (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]

Inventories consist of:

        
  

September 30,

2021

  

December 31,

2020

 
         

Raw materials

 $1,168,237  $928,221 

Work-in-process

  297,507   195,618 

Inventories

 $1,465,744  $1,123,839