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Note 11- Stock-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Number of shares, Outstanding (in shares) 283,181 241,734
Weighted average exercise price, Outstanding (in dollars per share) $ 13.95 $ 13.72
Number of shares, Options granted (in shares) 56,677 53,447
Weighted average exercise price, Options granted (in dollars per share) $ 13.40 $ 14.85
Number of shares, Options exercised (in shares) (12,000) 0
Weighted average exercise price, Options exercised (in dollars per share) $ 10.25 $ 0
Number of shares, Options terminated (in shares) (20,000) (12,000)
Weighted average exercise price, Options terminated (in dollars per share) $ 15.21 $ 13.38
Number of shares, Outstanding (in shares) 307,858 283,181
Weighted average exercise price, Outstanding (in dollars per share) $ 13.93 $ 13.95
Aggregate intrinsic value, Outstanding $ 1,238,009  
Number of shares, Exercisable (in shares) 221,027  
Weighted average exercise price, Exercisable (in dollars per share) $ 13.76  
Aggregate intrinsic value, Exercisable $ 942,314