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Note 5 - Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

 
  

2025

  

2024

 
         

Selling, general and administrative

 $24,920  $53,117 

Research, development and engineering

  6,740   12,936 
  $31,660  $66,053 
  

Nine Months Ended September 30,

 
  

2025

  

2024

 
         

Selling, general and administrative

 $87,466  $140,142 

Research, development and engineering

  18,519   31,475 
  $105,985  $171,617