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Note 5 - Patents and Trademarks, Net (Tables)
3 Months Ended
Nov. 30, 2019
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    November 30, 2019   August 31, 2019
Patents and trademarks   $
2,960,942
    $
2,938,876
 
Less accumulated amortization    
(1,988,428
)    
(1,929,907
)
    $
972,514
    $
1,008,969