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Note 5 - Share Based Compensation (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three Months Ended

March 31,

 
   

2023

   

2022

 
                 
                 

Selling, general and administrative

  $ 55,453     $ 92,426  

Research, development and engineering

    15,922       17,271  
    $ 71,375     $ 109,697