Note 9 - Warrants - Schedule of Equity-Classified Warrants (Details) - $ / shares	3 Months Ended
	Dec. 31, 2024	Oct. 01, 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)	(1,079)
Forfeited, warrant, weighted average exercise price (in dollars per share)	$ 176.06
Exercisable, warrants (in shares)	47,878
Exercisable, warrant, weighted average exercise price (in dollars per share)	$ 37.75
Warrants to Purchase Common Stock [Member]
Outstanding, warrants (in shares)	48,957
Outstanding, warrant, weighted average exercise price (in dollars per share)	$ 29.48
Outstanding, warrant, contractual term (Year)	2 years 11 months 23 days	3 years 5 months 1 day
Outstanding, warrants (in shares)	47,878
Outstanding, warrant, weighted average exercise price (in dollars per share)	$ 26.17
Exercisable, warrants (in shares)	47,878
Exercisable, warrant, weighted average exercise price (in dollars per share)	$ 26.17