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Note 5 - Patents and Trademarks, Net (Tables)
 6 Months Ended
Feb. 29, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    February 29, 2020   August 31, 2019
Patents and trademarks   $
2,978,210
     $
2,938,876
  
Less accumulated amortization    
(2,048,078
 )    
(1,929,907
 )
    $
930,132
     $
1,008,969