Note 10 - Warrants - Schedule of Equity-Classified Warrants (Details) - $ / shares	3 Months Ended
	Dec. 31, 2023	Sep. 30, 2023
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)	0
Forfeited, warrant, weighted average exercise price (in dollars per share)	$ 0
Class of warrants, exercisable (in shares)	50,309
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 9 months 25 days	4 years 25 days
Outstanding, warrants (in shares)	50,309
Outstanding, warrant, weighted average exercise price (in dollars per share)	$ 37.75
Class of warrants, exercisable (in shares)	50,309
Exercisable, weighted average exercise price (in dollars per share)	$ 37.75