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Note 10 - Stock-based Compensation - Stock Option Activity (Details)
 6 Months Ended
Feb. 28, 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 February 28, 2023 (in dollars per share) | $ / shares $ 10.52