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Note 10 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Number of shares, Outstanding (in shares) 697,406 615,716
Weighted average exercise price, Outstanding (in dollars per share) $ 7.29 $ 6.97
Number of shares, Options granted (in shares) 141,767 94,504
Weighted average exercise price, Options granted (in dollars per share) $ 18.23 $ 9.18
Number of shares, Options exercised (in shares)   (12,814)
Weighted average exercise price, Options exercised (in dollars per share) $ 5.80
Number of shares, Options terminated (in shares)
Weighted average exercise price, Options terminated (in dollars per share)
Number of shares, Options exercised (in shares) 0 (8,820)
Number of shares, Outstanding (in shares) 839,173 697,406
Weighted average exercise price, Outstanding (in dollars per share) $ 9.13 $ 7.29
Aggregate intrinsic value, Outstanding $ 2,610,422  
Number of shares, Exercisable (in shares) 640,617  
Weighted average exercise price, Exercisable (in dollars per share) $ 7.20  
Aggregate intrinsic value, Exercisable $ 2,403,847