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Note 11 - Stock-Based Compensation (Tables)
12 Months Ended
Aug. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
August 31, 2013
   
August 31, 2012
 
Dividend yield
      0.00%         0.00 %
Expected volatility
      48.0%         48.8 %
Expected life of option (years)
    5 - 10       5  
Weighted average risk-free interest rate
      0.71%         1.31 %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number of
Shares (#)
   
Weighted Average
Exercise Price
   
Aggregate
Intrinsic Value
 
Outstanding at August 31, 2011
    189,839     $ 9.07        
Options granted
    26,000       16.45        
Options exercised
    (3,966 )     8.71        
Options terminated
    (8,000 )     9.23        
                       
Outstanding at August 31, 2012
    203,873     $ 10.01        
Options granted
    118,294       10.25        
Options exercised
    (37,040 )     9.96        
Options terminated
    (24,500 )     13.12        
                       
Outstanding at August 31, 2013
    260,627     $ 9.84     $ 1,358,325  
                         
Exercisable at August 31, 2013
    134,998     $ 9.48     $ 768,043