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Note 5 - Patents and Trademarks, Net (Tables)
6 Months Ended
Feb. 28, 2019
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    February 28, 2019   August 31, 2018
Patents and trademarks   $
2,881,841
    $
2,824,440
 
Less accumulated amortization    
(1,797,528
)    
(1,668,183
)
    $
1,084,313
    $
1,156,257