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Note 6 - Share Based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended June 30,

 
  

2021

  

2020

 
         

Selling, general and administrative

 $30,704  $140,328 

Research, development and engineering

  10,419   2,511 
  $41,123  $142,839 
  

Six Months Ended June 30,

 
  

2021

  

2020

 
         

Selling, general and administrative

 $159,648  $581,636 

Research, development and engineering

  22,623   73,922 
  $182,271  $655,558