Note 10 - Stock-based Compensation - Stock Option Activity (Details)	9 Months Ended
	May 31, 2023 $ / shares shares
Outstanding as of August 31, 2022 (in shares) | shares	1,544,727
Outstanding as of August 31, 2022 (in dollars per share) | $ / shares	$ 10.23
Granted (in shares) | shares	277,613
Granted (in dollars per share) | $ / shares	$ 11.41
Exercised (in shares) | shares	178,331
Exercised (in dollars per share) | $ / shares	$ 6.03
Outstanding as of February 28, 2023 (in shares) | shares	1,644,009
Outstanding as of May 31, 2023 (in dollars per share) | $ / shares	$ 10.88
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | shares	1,166,772
Number of shares, Exercisable (in dollars per share) | $ / shares	$ 10.51