Annual report pursuant to Section 13 and 15(d)

Note 17 - Share-based Compensation - Stock Options, Valuation Assumptions (Details)

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Note 17 - Share-based Compensation - Stock Options, Valuation Assumptions (Details) - $ / shares
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Grant date fair value (in dollars per share) $ 17.27    
Employees [Member]      
Volatility 30.80%    
Risk-free rate of return 1.62%    
Dividend yield 4.42%    
Expected average life (years) (Year) 5 years 328 days    
Grant date fair value (in dollars per share) $ 2.85    
Independent Directors [Member]      
Volatility 30.80% 31.30% 31.50%
Risk-free rate of return 1.55% 2.80% 1.76%
Dividend yield 3.97% 3.24% 2.47%
Expected average life (years) (Year) 5 years 109 days 5 years 4 years 219 days
Grant date fair value (in dollars per share) $ 3.30 $ 5.30 $ 6.93
Fair value as a % of exercise price 18.80% 22.60% 22.50%