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Note 11 - Stock-based Compensation (Tables)
9 Months Ended
May 31, 2016
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Nine Months Ended
    May 31, 2016   May 31, 2015
Dividend yield     0.00 %     0.00 %
Expected volatility     46.0 %     46.6 %
Expected life of option (years)     10       10  
Average risk-free interest rate     1.63 %     1.63 %