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Note 6 - Share-based Compensation - Stock Option Activity (Details)
 3 Months Ended
Mar. 31, 2024
$ / shares
shares
Outstanding, shares (in shares) | shares 5,469,247
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 3.08
Granted. shares (in shares) | shares 772,600
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 1.59
Exercised, shares (in shares) | shares 0
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0
Expired, shares (in shares) | shares (332,500)
Expired, weighted average exercise price (in dollars per share) | $ / shares $ 1.95
Canceled, shares (in shares) | shares 0
Canceled, weighted average exercise price (in dollars per share) | $ / shares $ 0
Outstanding, shares (in shares) | shares 5,909,347
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 2.95
Exercisable, shares (in shares) | shares 4,486,623
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 3.19