Note 10 - Warrants - Schedule of Equity-Classified Warrants (Details) - $ / shares	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Granted, warrants (in shares)	0
Granted, warrant, weighted average exercise price (in dollars per share)	$ 0
Exercised, warrants (in shares)	0
Exercised, warrant, weighted average exercise price (in dollars per share)	$ 0
Forfeited, warrants (in shares)	(267)
Forfeited, warrant, weighted average exercise price (in dollars per share)	$ 1,024.38
Exercisable, warrants (in shares)	5,901
Exercisable, warrant, weighted average exercise price (in dollars per share)	$ 208.75
Warrants to Purchase Common Stock [Member]
Outstanding, warrants (in shares)	6,168
Outstanding, warrant, weighted average exercise price (in dollars per share)	$ 244.06
Outstanding, warrant, contractual term (Year)	4 years 25 days	2 years 3 months 18 days
Outstanding, warrants (in shares)	5,901
Outstanding, warrant, weighted average exercise price (in dollars per share)	$ 208.75
Exercisable, warrants (in shares)	5,901
Exercisable, warrant, weighted average exercise price (in dollars per share)	$ 208.75