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Note 10 - Stock-Based Compensation (Tables)
9 Months Ended
May 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    May 31,  
    2013   2012  
 
Dividend yield
   
0.00%
  0.00%  
 
Expected volatility
   
48.0%
  48.8%  
 
Expected life of option (years)
5 -
10
  5  
 
Average risk-free interest rate
   
0.71%
  1.31%