Note 5 - Patents and Trademarks, Net (Details Textual) - Patents and Trademarks [Member]	9 Months Ended
	May 31, 2020 USD ($)
Finite-Lived Intangible Asset, Useful Life (Year)	7 years
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 200,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	200,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	200,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	200,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 200,000