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Note 5 - Patents and Trademarks, Net (Tables)
12 Months Ended
Aug. 31, 2018
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    August 31, 2018   August 31, 2017
Patents and trademarks   $
2,824,440
    $
2,737,959
 
Less accumulated amortization    
(1,668,183
)    
(1,415,870
)
    $
1,156,257
    $
1,322,089