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Note 5 - Patents and Trademarks, Net (Tables)
 9 Months Ended
May 31, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    May 31, 2020   August 31, 2019
Patents and trademarks   $
2,889,223
     $
2,938,876
  
Less accumulated amortization    
(2,049,688
 )    
(1,929,907
 )
    $
839,535
     $
1,008,969