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Note 5 - Patents and Trademarks, Net (Tables)
9 Months Ended
May 31, 2021
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
  

May 31, 2021

  

August 31, 2020

 

Patents and trademarks

 $3,003,862  $2,907,852 

Less accumulated amortization

  (2,257,557)  (2,105,846)
  $746,305  $802,006