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Note 13 - Stock-based Compensation and Purchase Plans - Assumptions Used to Estimate Fair Values (Details) - $ / shares
12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Risk-free interest rates 4.52% 4.52% 0.46%
Expected life of option grants (in years) (Year) 3 years 3 years 3 years
Expected volatility of underlying stock 29.50% 29.50% 46.70%
Expected quarterly dividends (per share) (in dollars per share) $ 0.28 $ 0.28 $ 0.24