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Note 5 - Patents and Trademarks, Net (Tables)
 9 Months Ended
May 31, 2019
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
      May 31, 2019       August 31, 2018  
Patents and trademarks   $
2,911,662
     $
2,824,440
  
Less accumulated amortization    
(1,863,413
 )    
(1,668,183
 )
    $
1,048,249
     $
1,156,257