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Note 10 - Stock-based Compensation - Stock Option Activity (Details)
 3 Months Ended
Nov. 30, 2022
$ / shares
shares
Number of shares, Outstanding (in shares) | shares 1,544,727
Weighted average exercise price, Outstanding (in dollars per share) | $ / shares $ 10.23
Number of shares, Options granted (in shares) | shares 272,102
Weighted average exercise price, Options granted (in dollars per share) | $ / shares $ 11.38
Number of shares, Options exercised (in shares) | shares (178,331)
Weighted average exercise price, Options exercised (in dollars per share) | $ / shares $ 6.03
Number of shares, Options Forfeited (in shares) | shares 0
Weighted average exercise price, Options forfeited (in dollars per share) | $ / shares $ 0
Number of shares, Outstanding (in shares) | shares 1,638,498
Weighted average exercise price, Outstanding (in dollars per share) | $ / shares $ 10.88