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Note 11 - Stock-based Compensation (Tables)
9 Months Ended
May 31, 2017
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Nine Months Ended
    May 31, 2017   May 31, 2016
Dividend yield    
0.00
%    
0.00
%
Expected volatility    
46.4
%    
46.0
%
Expected life of option (in years)    
10
     
10
 
Average risk-free interest rate    
1.63
%    
1.63
%