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Note 11 - Stock-Based Compensation (Details) - Stock Option Activity (USD $)
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Stock Option Activity [Abstract]      
Outstanding 239,000 260,627 203,873
Options Outstanding, Weighted Average Exercise Price $ 11.66 $ 9.84 $ 10.01
Options Outstanding, Aggregate Intrinsic Value $ 2,163,147    
Options granted 56,373 118,294  
Options granted, Weighted Average Exercise Price $ 14.83 $ 10.25  
Options exercised (74,000) (37,040)  
Options exercised, Weighted Average Exercise Price $ 7.82 $ 9.96  
Options terminated (4,000) (24,500)  
Options terminated, Weighted Average Exercise Price $ 8.57 $ 13.12  
Exercisable at August 31, 2014 136,731    
Exercisable at August 31, 2014 $ 10.83    
Exercisable at August 31, 2014 $ 1,351,499