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Note 5 - Patents and Trademarks, Net (Tables)
3 Months Ended
Nov. 30, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
  

November 30, 2020

  

August 31, 2020

 

Patents and trademarks

 $2,938,258  $2,907,852 

Less accumulated amortization

  (2,155,835)  (2,105,846)
  $782,423  $802,006