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Note 5 - Patents and Trademarks, Net
 3 Months Ended
Nov. 30, 2018
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]
5.
       PATENTS AND TRADEMARKS, NET
 
Patents and trademarks, net consisted of the following:
 
    November 30, 2018   August 31, 2018
Patents and trademarks   $
2,842,370
     $
2,824,440
  
Less accumulated amortization    
(1,732,625
 )    
(1,668,183
 )
    $
1,109,745
     $
1,156,257
  
 
Patent and trademark costs are amortized over
seven
years. Costs incurred related to patents and trademarks are capitalized until filed and approved, at which time the amounts capitalized to date are amortized and any further costs, including maintenance costs, are expensed as incurred. Amortization expense is estimated to approximate
$260,000
in each of the next
five
fiscal years.