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Note 6 - Incentive Stock Plan - Option Activity Under Stock Plan (Details) - The 2021 Incentive Stock Plan [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Outstanding (in shares) 675,833  
Outstanding, weighted average exercise price (in dollars per share) $ 3.07  
Options outstanding, weighted average remaining life (Year) 9 years 10 days 9 years 8 months 8 days
Issued (in shares) 82,000  
Issued, weighted average exercise price (in dollars per share) $ 1.77  
Issued, weighted average remaining life (Year) 10 years  
Forfeited (in shares) (87,591)  
Forfeited, weighted average exercise price (in dollars per share) $ 3.02  
Forfeited, weighted average remaining life (Year) 9 years 1 month 6 days  
Exercised (in shares) 0  
Exercised, weighted average exercise price (in dollars per share) $ 0  
Outstanding (in shares) 670,242 675,833
Outstanding, weighted average exercise price (in dollars per share) $ 2.92 $ 3.07