Note 6 - Capital Shares - Option Activity (Details) - $ / shares	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Balance, number of options (in shares)	383,040	420,615
Balance, weighted average exercise price (in dollars per share)	$ 24.93	$ 25.6
Balance, weighted average grant date fair value (in dollars per share)	$ 18.33	$ 18.84
Forfeited, number of options (in shares)	(4,431)	(2,401)
Forfeited, weighted average exercise price (in dollars per share)	$ 25.2	$ 15
Forfeited, weighted average grant date fair value (in dollars per share)	$ 17.69	$ 10.7
Expired, number of options (in shares)	(374)	(35,674)
Expired, weighted average exercise price (in dollars per share)	$ 246.96	$ 33.18
Expired, weighted average grant date fair value (in dollars per share)	$ 246.96	$ 24.63
Granted, number of options (in shares)		500
Granted, weighted average exercise price (in dollars per share)		$ 4.1
Granted, weighted average grant date fair value (in dollars per share)		$ 3.1
Balance, number of options (in shares)	378,235	383,040
Balance, weighted average exercise price (in dollars per share)	$ 24.71	$ 24.93
Balance, weighted average grant date fair value (in dollars per share)	$ 18.11	$ 18.33