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Note 4 - Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
As of December 31,
  
   
2019
    
2018
  
Computer equipment
   $
98,307
     $
186,456
  
Lab equipment
    
39,651
      
448,198
  
Furniture
    
3,100
      
500,201
  
     
141,058
      
1,134,855
  
Less accumulated depreciation
    
(125,544
 )    
(1,107,108
 )
Equipment, net
   $
15,514
     $
27,747