Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Share-based Compensation - Stock Options, Valuation Assumptions (Details)

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Note 10 - Share-based Compensation - Stock Options, Valuation Assumptions (Details) - Independent Directors [Member]
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Volatility 30.80% 31.30%
Risk-free rate of return 1.55% 2.80%
Dividend yield 3.97% 3.24%
Expected average life (years) (Year) 5 years 109 days 5 years