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Note 6 - Stockholders' Equity and Stock-based Compensation - Summary of Performance Option Activity (Details) - Performance Options [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2024
$ / shares
shares
Dec. 31, 2023
$ / shares
shares
Options balances, number of shares (in shares) | shares 1,224,130  
Options balances, weighted average exercise price (in dollars per share) | $ / shares $ 5.51  
Options balances, weighted average remaining life (Year) 7 years 10 months 2 days 8 years 6 months 10 days
Options granted, number of shares (in shares) | shares 39,000  
Options granted, weighted average exercise price (in dollars per share) | $ / shares $ 8.44  
Options exercised, number of shares (in shares) | shares (9,950)  
Options exercised, weighted average exercise price (in dollars per share) | $ / shares $ 2.92  
Options canceled, number of shares (in shares) | shares (3,000)  
Options canceled, weighted average exercise price (in dollars per share) | $ / shares $ 2.92  
Options expired, number of shares (in shares) | shares (1,000)  
Options expired, weighted average exercise price (in dollars per share) | $ / shares $ 2.92  
Options balances, number of shares (in shares) | shares 1,249,180 1,224,130
Options balances, weighted average exercise price (in dollars per share) | $ / shares $ 5.63 $ 5.51
Options exercisable, number of shares (in shares) | shares 432,678  
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 7.69  
Options exercisable, weighted average remaining life (Year) 6 years 11 months 23 days