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Note 6 - Common Stock Options - Changes in Common Stock Options Issued (Details)
 3 Months Ended
Mar. 31, 2024
$ / shares
shares
Options outstanding (in shares) | shares 5,039,518
Granted (in shares) | shares 23,000
Exercised (in shares) | shares (13,917)
Forfeitures (in shares) | shares (614,750)
Options outstanding (in shares) | shares 4,433,851
Minimum [Member]  
Outstanding, Exercise Price (in dollars per share) $ 2.71
Granted, Exercise Price (in dollars per share) 4.05
Exercised, Exercise Price (in dollars per share) 3.65
Forfeitures, Exercise Price (in dollars per share) 3.84
Outstanding, Exercise Price (in dollars per share) 2.71
Maximum [Member]  
Outstanding, Exercise Price (in dollars per share) 21.74
Granted, Exercise Price (in dollars per share) 6.45
Exercised, Exercise Price (in dollars per share) 5.43
Forfeitures, Exercise Price (in dollars per share) 19.22
Outstanding, Exercise Price (in dollars per share) 21.74
Weighted Average [Member]  
Outstanding, Exercise Price (in dollars per share) 9.46
Granted, Exercise Price (in dollars per share) 5.59
Exercised, Exercise Price (in dollars per share) 3.96
Forfeitures, Exercise Price (in dollars per share) 10.92
Outstanding, Exercise Price (in dollars per share) $ 9.25