Note 10 - Warrants - Schedule of Equity-Classified Warrants (Details) - $ / shares	9 Months Ended
	Jun. 30, 2024	Sep. 30, 2023
Forfeited, warrants (in shares)	(1,352)
Forfeited, warrant, weighted average exercise price (in dollars per share)	$ 337.5
Class of warrants, exercisable (in shares)	48,957
Exercisable, weighted average exercise price (in dollars per share)	$ 37.75
Warrants to Purchase Common Stock [Member]
Outstanding, warrants (in shares)	50,309
Outstanding, warrant, weighted average exercise price (in dollars per share)	$ 37.75
Outstanding, warrant, contractual term (Year)	3 years 5 months 1 day	4 years 25 days
Outstanding, warrants (in shares)	48,957
Outstanding, warrant, weighted average exercise price (in dollars per share)	$ 29.48
Class of warrants, exercisable (in shares)	48,957
Exercisable, weighted average exercise price (in dollars per share)	$ 29.48