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Note 5 - Patents and Trademarks, Net (Tables)
 6 Months Ended
Feb. 28, 2017
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    February 28, 2017   August 31, 2016
Patents and trademarks   $
2,661,393
     $
2,575,435
  
Less accumulated amortization    
(1,356,354
 )    
(1,296,838
 )
    $
1,305,039
     $
1,278,597