Note 11 - Stock-based Compensation - Stock Option Activity (Details) - $ / shares	9 Months Ended
	May 31, 2025	May 31, 2024
Outstanding, shares (in shares)	1,752,665	1,557,131
Outstanding, weighted average exercise price (in dollars per share)	$ 11.47	$ 11.08
Options granted, shares (in shares)	245,190	269,845
Options granted, weighted average exercise price (in dollars per share)	$ 13.26	$ 13.25
Options exercised, shares (in shares)	0	(21,301)
Options exercised, weighted average exercise price (in dollars per share)	$ 0	$ 9.04
Cancelled (in shares)	0	0
Cancelled (in dollars per share)	$ 0	$ 0
Outstanding, shares (in shares)	1,997,855	1,805,675
Outstanding, weighted average exercise price (in dollars per share)	$ 11.69	$ 11.43
Exercisable as of May 31, 2024 (in shares)	1,550,993	1,350,643
Exercisable as of May 31, 2024 (in dollars per share)	$ 11.32	$ 10.88