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Note 7 - Patents (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
June 30, 2020
  
   
Cost
    
Accumulated Amortization
    
Net
  
Patents-foundation intellectual property
   $
1,377,863
     $
(1,022,108
 )   $
355,755
  
Total
   $
1,377,863
     $
(1,022,108
 )   $
355,755
  
   
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