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Note 12 - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Number of shares, Outstanding (in shares) 239,000 260,627 203,873
Weighted average exercise price, Outstanding (in dollars per share) $ 11.66 $ 9.84 $ 10.01
Number of shares, Options granted (in shares) 45,067 56,373 118,294
Weighted average exercise price, Options granted (in dollars per share) $ 20.10 $ 14.83 $ 10.25
Number of shares, Options exercised (in shares) (38,333) (74,000) (37,040)
Exercise price (in dollars per share) $ 9 $ 7.82 $ 9.96
Number of shares, Options terminated (in shares) (4,000) (4,000) (24,500)
Weighted average exercise price, Options terminated (in dollars per share) $ 10.20 $ 8.57 $ 13.12
Number of shares, Outstanding (in shares) 241,734 239,000 260,627
Weighted average exercise price, Outstanding (in dollars per share) $ 13.72 $ 11.66 $ 9.84
Aggregate intrinsic value, Outstanding $ 677,475    
Number of shares, Exercisable (in shares) 160,453    
Weighted average exercise price, Exercisable (in dollars per share) $ 12.13    
Aggregate intrinsic value, Exercisable $ 577,528