Note 10 - Subsequent Events (Details Textual) - Subsequent Event [Member]	Oct. 25, 2022 USD ($) $ / shares shares
Shares Issued, Price Per Share | $ / shares	$ 0.14
Proceeds from Issuance or Sale of Equity, Total | $	$ 2,055,000
The Units Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	1
Pre-funded Units Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	1
Units Common Warrant [Member]
Units Issued, Warrants Per Unit	1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	1
Offering Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 0.14
Warrants and Rights Outstanding, Term	5 years
Warrants and Rights Outstanding, Warrants Exercised	2,892,858
Units [Member]
Stock Issued During Period, Units, New Issues	11,783,572
Units Issued, Common Shares Per Unit	1
Units Issued, Warrants Per Unit	1
Pre-funded Units [Member]
Stock Issued During Period, Units, New Issues	2,892,858
Units Issued, Warrants Per Unit	1