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Note 10 - Stock-based Compensation (Tables)
3 Months Ended
Nov. 30, 2020
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

November 30,

 
  

2020

  

2019

 

Dividend yield

  2.37%  2.15%

Expected volatility

  45.6%  45.1%

Expected life of option (in years)

  10   10 

Average risk-free interest rate

  0.28%  1.57%