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Note 7 - Patents (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
September 30, 2020
  
Cost
    
Accumulated Amortization
    
Net
  
Patents-foundation intellectual property
   $
1,377,863
     $
(1,035,362
 )   $
342,501
  
Total
   $
1,377,863
     $
(1,035,362
 )   $
342,501
  
December 31, 2019
  
Cost
    
Accumulated Amortization
    
Net
  
Patents-foundation intellectual property
   $
1,377,863
     $
(995,603
 )   $
382,260
  
Total
   $
1,377,863
     $
(995,603
 )   $
382,260