Note N - Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Pension Plan [Member]
Service cost	$ 347	$ 373
Interest cost	3,400	3,609
Prior service cost	21	0
Expected return on plan assets	(3,411)	(4,283)
Amortization of transition obligation	42	38
Amortization of prior service cost	26	35
Amortization of actuarial net loss	984	65
Net periodic benefit cost (income)	1,409	(163)
Service cost	352	373
Interest cost	3,404	3,609
Other Postretirement Benefits Plan [Member]
Prior service cost	0	0
Amortization of prior service cost	0	(88)
Amortization of actuarial net loss	(262)	(620)
Net periodic benefit cost (income)	(90)	(509)
Service cost	7	8
Interest cost	$ 165	$ 191