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Note 10 - Stock-based Compensation (Tables)
9 Months Ended
May 31, 2020
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
Nine Months Ended
 
May 31, 2020
 
May 31, 2019
Dividend yield
2.15%
 
1.32%
Expected volatility
45.1%
 
45.8%
Expected life of option
(in years)
10
 
10
Average risk-free interest rate
1.57%
 
2.75%