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Note 5 - Patents and Trademarks, Net (Tables)
 12 Months Ended
Aug. 31, 2019
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    August 31, 2019   August 31, 2018
Patents and trademarks   $
2,938,876
     $
2,824,440
  
Less accumulated amortization    
(1,929,907
 )    
(1,668,183
 )
    $
1,008,969
     $
1,156,257