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Note 6 - Warrants (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2022
Mar. 01, 2021
Share Price (in dollars per share)   $ 0.20 $ 0.20  
Stock Issued During Period, Shares, Warrants Exercised (in shares)   1,283,333    
Proceeds from Issuance of Warrants   $ 164,000    
Note Payable, Maturing March 8, 2023 [Member]        
Debt Instrument, Face Amount $ 50,000     $ 50,000
Debt Instrument, Term (Year) 2 years      
Six-month Warrants in Connection With the 2020 Unit Offering [Member]        
Warrants and Rights Outstanding, Term (Year)     6 months  
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   5,435,996 13,568,524  
Six-month Warrants in Connection With the 2020 Unit Offering [Member] | Minimum [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.14 $ 0.19  
Six-month Warrants in Connection With the 2020 Unit Offering [Member] | Maximum [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.23 $ 0.26  
Five-year Warrants in Connection With the 2020 Unit Offering [Member]        
Warrants and Rights Outstanding, Term (Year)   5 years 5 years  
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   5,435,996 13,568,524  
Five-year Warrants in Connection With the 2020 Unit Offering [Member] | Minimum [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.16 $ 0.24  
Five-year Warrants in Connection With the 2020 Unit Offering [Member] | Maximum [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.29 $ 0.33  
Warrants Issued in Connection with Conversion of Interest on Note Payable Maturing March 8, 2023 [Member]        
Warrants and Rights Outstanding, Term (Year) 5 years      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) 225,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.16      
Warrants and Rights Outstanding $ 35,000