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Note 4 - Equity - Common Stock Purchase Warrant Activity (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Outstanding, number of warrants (in shares) 2,204,747 2,154,747
Outstanding, weighted average exercise price (in dollars per share) $ 4.39 $ 4.37
Issued, number of warrants (in shares) 100,000 50,000
Issued, weighted average exercise price (in dollars per share) $ 1.44 $ 5.29
Cancelled or expired, number of warrants (in shares) (112,993)  
Cancelled or expired, weighted average exercise price (in dollars per share) $ 4.47  
Exercised, number of warrants (in shares) (13,643)  
Exercised, weighted average exercise price (in dollars per share) $ 0.50  
Outstanding, number of warrants (in shares) 2,178,111 2,204,747
Outstanding, weighted average exercise price (in dollars per share) $ 4.28 $ 4.39
Vested or expected to vest, number of warrants (in shares) 25,002  
Vested or expected to vest, weighted average exercise price (in dollars per share) $ 3.02  
Exercisable, number of warrants (in shares) 1,869,778  
Exercisable, weighted average exercise price (in dollars per share) $ 4.63