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Note 10 - Stock-based Compensation (Tables)
9 Months Ended
May 31, 2019
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Nine Months Ended
      May 31, 2019       May 31, 2018  
Dividend yield    
1.32
%    
2.18
%
Expected volatility    
45.8
%    
45.9
%
Expected life of option (years)    
10
     
10
 
Average risk-free interest rate    
2.75
%    
1.87
%