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Note 10 - Stock-based Compensation (Tables)
3 Months Ended
Nov. 30, 2018
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    November 30,
    2018   2017
Dividend yield    
1.32%
     
2.18%
 
Expected volatility    
45.8%
     
45.9%
 
Expected life of option (in years)    
10
     
10
 
Average risk-free interest rate    
2.75%
     
1.87%