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Note 7 - Patents (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
  

June 30, 2022

     
  

Cost

  

Accumulated Amortization

  

Net

 

Patents-foundation intellectual property

  1,377,863   (1,127,013)  250,850 

Total

  1,377,863   (1,127,013)  250,850 
  

December 31, 2021

     
  

Cost

  

Accumulated Amortization

  

Net

 

Patents-foundation intellectual property

  1,377,863   (1,100,244)  277,619 

Total

  1,377,863   (1,100,244)  277,619