Note 5 - Patents and Trademarks, Net (Details Textual) - Patents and Trademarks [Member]	9 Months Ended
	May 31, 2019 USD ($)
Finite-Lived Intangible Asset, Useful Life	7 years
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 260,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	260,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	260,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	260,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 260,000