Note 10 - Share-based Payment Award, Restricted Stock Units, Valuation Assumptions (Details) |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2014 |
|
| Restricted Stock Units (RSUs) [Member] | |||
| Volatility | 33.30% | ||
| Risk-free rate of return | 0.77% | ||
| Dividend yield | 1.99% | ||
| Expected average life (years) | 1 year 273 days | ||
| Volatility | 48.10% | 52.90% | 56.30% |
| Risk-free rate of return | 1.93% | 2.03% | 1.52% |
| Dividend yield | 1.95% | 2.09% | 1.55% |
| Expected average life (years) | 6 years 109 days | 6 years 255 days | 5 years 73 days |