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Note 5 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    2019   2018
Furniture and fixtures   $
35,407
     $
35,407
  
Computers and office equipment    
138,897
      
138,897
  
Lab equipment    
817,149
      
818,267
  
     
991,453
      
992,571
  
Less accumulated depreciation    
(950,417
 )    
(902,260
 )
Property and equipment, net   $
41,036
     $
90,311