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Note 9 - Stock-Based Compensation (Tables)
9 Months Ended
May 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Nine Months Ended
   
May 31, 2014
   
May 31, 2013
Dividend yield
    0.00 %     0.00%  
Expected volatility
    47.3 %     48.0%  
Expected life of option (years)
 
10
    5
-
10
Average risk-free interest rate
    1.36 %     0.71%