Note 15 - Subsequent Events (Details Textual) - USD ($)	May 09, 2022	Jul. 18, 2021
Warrants Issued to Investors in Private Placements [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.10
Warrants and Rights Outstanding, Term (Year)		3 years
Subsequent Event [Member]
Sale of Units, Maximum Units Allowed in Private Placement	$ 565,000
Sale of Unit, Price Per Unit (in dollars per share)	$ 0.03
Subsequent Event [Member] | Warrants Issued to Investors in Private Placements [Member]
Number of Warrant Received, Per Unit (in shares)	1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.10
Warrants and Rights Outstanding, Term (Year)	5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	4,166,667
Subsequent Event [Member] | Private Placement [Member]
Number of Common Stock Received, Per Unit (in shares)	1
Proceeds from Issuance of Private Placement	$ 125,000
Stock Issued During Period, Shares, New Issues (in shares)	4,166,667