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Note 11 - Shareholders' Equity - Assumptions to Estimate the Fair Value of Options Granted (Details) - Plan 1989 [Member]
12 Months Ended
Jun. 30, 2025
Expected life (in years) (Year) 5 years 3 months
Minimum [Member]  
Risk-free interest rate 4.10%
Expected volatility 57.10%
Expected dividend yield 4.10%
Maximum [Member]  
Risk-free interest rate 4.20%
Expected volatility 58.20%
Expected dividend yield 4.40%