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Note 10 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Outstanding at August 31, 2021 (in shares) 1,544,727 1,426,651
Outstanding at August 31, 2021 (in dollars per share) $ 10.23 $ 9.3
Options granted (in shares) 277,613 174,840
Options granted (in dollars per share) $ 11.41 $ 16.97
Options exercised (in shares) (265,209) (51,218)
Options exercised (in dollars per share) $ 6.46 $ 6.6
Options terminated (in shares) 0 (5,546)
Options terminated (in dollars per share) $ 0 $ 18.23
Outstanding at August 31, 2022 (in shares) 1,557,130 1,544,727
Outstanding at August 31, 2022 (in dollars per share) $ 11.08 $ 10.23
Outstanding at August 31, 2023 $ 4,240,525  
Exercisable at August 31, 2023 (in shares) 1,079,897  
Exercisable at August 31, 2023 (in dollars per share) $ 10.77  
Exercisable at August 31, 2023 $ 3,329,061