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Note 5 - Patents and Trademarks, Net (Tables)
 3 Months Ended
Nov. 30, 2018
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    November 30, 2018   August 31, 2018
Patents and trademarks   $
2,842,370
     $
2,824,440
  
Less accumulated amortization    
(1,732,625
 )    
(1,668,183
 )
    $
1,109,745
     $
1,156,257