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Note 6 - Share Based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

March 31,

 
  

2022

  

2021

 
         
         

Selling, general and administrative

 $92,426  $128,944 

Research, development and engineering

  17,271   12,204 
  $109,697  $141,148