Note 17 - Share-based Compensation - Stock Options, Valuation Assumptions (Details) - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Grant date fair value (in dollars per share) | $ 12.97 | ||
| Share-based Payment Arrangement, Employee [Member] | |||
| Volatility | 30.80% | ||
| Risk-free rate of return | 1.72% | ||
| Dividend yield | 5.04% | ||
| Expected average life (years) (Year) | 6 years 8 months 12 days | ||
| Grant date fair value (in dollars per share) | $ 2.24 | ||
| Fair value as a % of exercise price | 13.30% | ||
| Share-based Payment Arrangement, Nonemployee [Member] | |||
| Volatility | 38.20% | 30.80% | 31.30% |
| Risk-free rate of return | 0.35% | 1.55% | 2.80% |
| Dividend yield | 3.26% | 3.97% | 3.24% |
| Expected average life (years) (Year) | 5 years 6 months | 5 years 3 months 18 days | 5 years |
| Grant date fair value (in dollars per share) | $ 3.20 | $ 3.30 | $ 5.30 |
| Fair value as a % of exercise price | 24.70% | 18.80% | 22.60% |