Note 10 - Stock-based Compensation (Tables)

6 Months Ended

Feb. 29, 2020

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three and Six Months Ended
	February 29, 2020	February 28, 2019
Dividend yield	2.15%	1.32%
Expected volatility	45.2%	45.8%
Expected life of option (years)	10	10
Average risk-free interest rate	1.57%	2.75%