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Note 6 - Stockholders' Equity - Warrants (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Outstanding, number of shares (in shares) 4,268,221  
Outstanding, weighted average exercise price (in dollars per share) $ 2.18  
Outstanding, weighted average remaining life (Year) 3 months 6 months
Outstanding, Intrinsic value $ 125,828 $ 0
Issued, number of shares (in shares) 0  
Issued, weighted average exercise price (in dollars per share) $ 0  
Exercised, number of shares (in shares) 0  
Exercised, weighted average exercise price (in dollars per share) $ 0  
Outstanding and exercisable at March 31, 2023 (in shares) 4,268,221 4,268,221
Outstanding and exercisable at March 31, 2023 (in dollars per share) $ 2.18 $ 2.18