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Note 16 - Share-based Compensation - Stock Option Activity (Details)
 9 Months Ended
Jun. 30, 2024
$ / shares
shares
Outstanding (in shares) | shares 2,904,522
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 3.19
Granted (in shares) | shares 942,250
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 1.73
Forfeited/expired (in shares) | shares (481,032)
Forfeited/cancelled, weighted average grant date fair value (in dollars per share) | $ / shares $ 2.91
Exercised (in shares) | shares 0
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0
Outstanding (in shares) | shares 3,365,740
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 2.82
Exerciseable (in shares) | shares 1,096,854
Exerciseable, weighted average exercise price (in dollars per share) | $ / shares $ 3.52