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Note 5 - Patents and Trademarks, Net (Tables)
12 Months Ended
Aug. 31, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    August 31, 2020   August 31, 2019
Patents and trademarks   $
2,907,852
    $
2,938,876
 
Less accumulated amortization    
(2,105,846
)    
(1,929,907
)
    $
802,006
    $
1,008,969