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Note 10 - Stock-based Compensation (Tables)
3 Months Ended
Nov. 30, 2019
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    November 30,
    2019   2018
Dividend yield    
2.15
%    
1.32
%
Expected volatility    
45.1
%    
45.8
%
Expected life of option (years)    
10
     
10
 
Average risk-free interest rate    
1.57
%    
2.75
%