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Note 6 - Warrants (Details Textual) - USD ($)
12 Months Ended
Mar. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Share Price (in dollars per share)   $ 0.21  
Stock Issued During Period, Shares, Warrants Exercised (in shares)   1,283,333  
Proceeds from Warrant Exercises   $ 164,000 $ 0
Note Payable, Maturing March 8, 2023 [Member]      
Debt Instrument, Face Amount $ 50,000    
Debt Instrument, Term (Year) 2 years    
Warrants Issued in Connection with Investment from Three Investors [Member]      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   5,435,996  
Warrants Issued in Connection with Investment from Three Investors [Member] | Minimum [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.14  
Warrants Issued in Connection with Investment from Three Investors [Member] | Maximum [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.23  
Five Year Warrant [Member]      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   5,435,996  
Warrants and Rights Outstanding, Term (Month)   5 years  
Five Year Warrant [Member] | Minimum [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.16  
Five Year Warrant [Member] | Maximum [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.29  
Warrants Issued in Connection with Conversion of Interest on Note Payable Maturing March 8, 2023 [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.16    
Warrants and Rights Outstanding, Term (Month) 5 years    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 225,000    
Warrants and Rights Outstanding $ 35,000