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Note 9 - Stock-Based Compensation (Tables)
6 Months Ended
Feb. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Six Months Ended
 
   
February 28,
2014
   
February 28,
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%