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Note 10 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Number of shares, Outstanding (in shares) 307,858 283,181
Weighted average exercise price, Outstanding (in dollars per share) $ 13.93 $ 13.95
Number of shares, Options granted (in shares) 47,252 56,677
Weighted average exercise price, Options granted (in dollars per share) $ 18.35 $ 13.40
Number of shares, Options exercised (in shares) (4,410) (12,000)
Weighted average exercise price, Options exercised (in dollars per share) $ 11.59 $ 10.25
Number of shares, Options terminated (in shares) (20,000)
Weighted average exercise price, Options terminated (in dollars per share) $ 15.21
Number of shares, Options exercised (in shares) (6,407)  
Number of shares, Outstanding (in shares) 348,703 307,858
Weighted average exercise price, Outstanding (in dollars per share) $ 14.57 $ 13.93
Aggregate intrinsic value, Outstanding $ 7,737,763  
Number of shares, Exercisable (in shares) 267,850  
Weighted average exercise price, Exercisable (in dollars per share) $ 13.97  
Aggregate intrinsic value, Exercisable $ 6,007,547