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Note 5 - Share Based Compensation (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

 
  

2023

  

2022

 
         

Selling, general and administrative

 $56,414  $66,152 

Research, development and engineering

  15,406   17,547 
  $71,820  $83,699 
  

Nine Months Ended September 30,

 
  

2023

  

2022

 
         

Selling, general and administrative

 $171,833  $158,578 

Research, development and engineering

  48,758   34,818 
  $220,591  $193,396