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Note 11 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Outstanding, balance (in shares) 1,752,665 1,557,132
Outstanding, weighted average exercise price (in dollars per share) $ 11.47 $ 11.08
Options granted (in shares) 245,190 269,844
Options granted, weighted average exercise price (in dollars per share) $ 13.26 $ 13.25
Options exercised (in shares) (12,000) (74,309)
Options exercised, weighted average exercise price (in dollars per share) $ 7.43 $ 9.76
Options terminated (in shares) (62,717) 0
Options terminated, weighted average exercise price (in dollars per share) $ 7.43 $ 0
Outstanding, balance (in shares) 1,923,138 1,752,665
Outstanding, weighted average exercise price (in dollars per share) $ 11.86 $ 11.47
Outstanding, aggregate intrinsic value $ 62,547  
Exercisable, balance (in shares) 1,476,274  
Exercisable, weighted average exercise price (in dollars per share) $ 11.52  
Exercisable, aggregate intrinsic value $ 62,547