v3.26.1
Note 13 - Retirement Plans - Assumptions Used in Net Periodic Benefit Cost and Obligation (Details) - Pension Plan [Member]
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Net Periodic Benefit Costs:    
Discount rate 1.15% 1.20%
Rate of compensation increase 1.75% 1.75%
Expected long-term return on assets 1.50% 1.50%
Benefit Obligation:    
Discount rate 1.15% 1.20%
Rate of compensation increase 1.75% 1.75%