Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Share-based Compensation - Performance Unit Awards, Valuation Assumptions (Details)

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Note 11 - Share-based Compensation - Performance Unit Awards, Valuation Assumptions (Details) - Performance Shares [Member]
9 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Volatility 30.50% 32.10%
Risk-free rate of return 1.72% 2.72%
Dividend yield 3.97% 3.24%
Expected average life (years) (Year) 3 years 3 years