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Note 5 - Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Warrants outstanding, balance (in shares) 272,211  
Granted (in shares) [1] 1,731,767  
Exercised (in shares) (446,304)  
Forfeited, expired or cancelled (in shares) (204)  
Warrants outstanding, balance (in shares) 1,557,470 [1] 272,211
Warrants outstanding, weighted average exercise price (in dollars per share) $ 21.58 [1] $ 144.78
Granted, weighted average exercise price (in dollars per share) [1] 5.13  
Exercised, weighted average exercise price 5.61  
Forfeited, expired, or cancelled, weighted average exercise price $ 17,438.12  
Warrants outstanding, weighted average remaining contratual life (years) 5 years 11 months 23 days [1] 4 years 1 month 13 days
Granted, weighted average remaining contractual life [1] 6 years 6 months  
[1]

(1) The pre-funded common stock warrants granted and outstanding during and as of the nine months ended September 30, 2024 have a perpetual term and are therefore excluded from the calculation of the weighted average remaining contractual life.