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Note 8 - Stockholders' Equity - Warrants (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
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) 1 year 1 year 6 months
Outstanding, intrinsic value $ 130,704 $ 1,187,546
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 , number of shares (in shares) 4,268,221 4,268,221
Outstanding , weighted average exercise price (in dollars per share) $ 2.18 $ 2.18