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Note 5 - Patents and Trademarks, Net (Tables)
9 Months Ended
May 31, 2018
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    May 31, 2018   August 31, 2017
Patents and trademarks   $
2,800,553
    $
2,737,959
 
Less accumulated amortization    
(1,604,331
)    
(1,415,870
)
    $
1,196,222
    $
1,322,089