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Note 6 - Share Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   
Three Months Ended June 30,
  
   
20
20
    
201
9
  
                 
Selling, general and administrative
   $
140,328
     $
115,526
  
Research, development and engineering
    
2,511
      
15,528
  
    $
142,839
     $
131,054
  
   
Six Months Ended June 30,
  
   
20
20
    
201
9
  
                 
Selling, general and administrative
   $
581,636
     $
568,613
  
Research, development and engineering
    
73,922
      
88,475
  
    $
655,558
     $
657,088