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Note 6 - Incentive Stock Plan - Option Activity Under Stock Plan (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Options, weighted average remaining life (Year) 8 years 7 months 2 days  
Options, number (in shares) 211,875  
Options, weighted average exercise price (in dollars per share) $ 9.09  
The 2021 Incentive Stock Plan [Member]    
Options, number (in shares) 167,561  
Options, weighted average exercise price (in dollars per share) $ 11.68  
Options, weighted average remaining life (Year)   8 years 9 months 10 days
Issued, number (in shares) 75,000  
Issued, weighted average exercise price (in dollars per share) $ 3.65  
Issued, weighted average remaining life (Year) 10 years  
Forfeited, number (in shares) (30,686)  
Forfeited, weighted average exercise price (in dollars per share) $ 9.90  
Forfeited, weighted average remaining life (Year) 8 years 9 months 10 days  
Exercised, number (in shares) 0  
Exercised, weighted average exercise price (in dollars per share) $ 0  
Options, number (in shares)   167,561
Options, weighted average exercise price (in dollars per share)   $ 11.68