Note 15 - Share-based Compensation - Stock Option Activity (Details)	6 Months Ended
	Mar. 31, 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	897,250
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 1.7
Forfeited/expired (in shares) | shares	(423,948)
Forfeited/cancelled, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.85
Exercised (in shares) | shares	0
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Outstanding (in shares) | shares	3,377,824
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 2.84
Exerciseable (in shares) | shares	1,097,178
Exerciseable, weighted average exercise price (in dollars per share) | $ / shares	$ 3.49