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Note 5 - Patents and Trademarks, Net (Details Textual) - Patents and Trademarks [Member]
 9 Months Ended
May 31, 2018
USD ($)
Finite-Lived Intangible Asset, Useful Life 7 years
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 240,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two 240,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three 240,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four 240,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 240,000