Note 8 - Stock Based Compensation - Summary of Stock Option Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024
Outstanding (in shares)	44,035
Outstanding, weighted average exercise price (in dollars per share)	$ 123.58
Outstanding, weighted average remaining contractual term (Year)	2 years 10 months 20 days	3 years 1 month 20 days
Granted (in shares)	0
Granted, weighted average exercise price (in dollars per share)	$ 0
Exercised (in shares)	0
Exercised, weighted average exercise price (in dollars per share)	$ 0
Forfeited (in shares)	(112)
Forfeited, weighted average exercise price (in dollars per share)	$ 10.35
Outstanding (in shares)	43,923	44,035
Outstanding, weighted average exercise price (in dollars per share)	$ 123.83	$ 123.58
Exercisable (in shares)	43,923
Exercisable, weighted average exercise price (in dollars per share)	$ 123.87
Exercisable (Year)	2 years 10 months 20 days