Note 10 - Share-based Compensation - Stock Options, Valuation Assumptions (Details) |
12 Months Ended | ||
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Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2015 |
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| Volatility | 36.80% | 48.10% | 52.90% |
| Risk-free rate of return | 1.03% | 1.93% | 2.03% |
| Dividend yield | 1.96% | 1.95% | 2.09% |
| Expected average life (years) (Year) | 5 years | 6 years 109 days | 6 years 255 days |
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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