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Note 10 - Stock-based Compensation (Tables)
6 Months Ended
Feb. 28, 2021
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 

Three and Six Months Ended

 

February 28, 2021

 

February 29, 2020

Dividend yield

2.37%

 

2.15%

Expected volatility

45.6%

 

45.2%

Expected life of option (in years)

10

 

10

Average risk-free interest rate

0.28%

 

1.57%