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

August 31, 2021

  

August 31, 2020

 

Patents and trademarks

 $3,018,507  $2,907,852 

Less accumulated amortization

  (2,308,935)  (2,105,846)
  $709,572  $802,006