Note N - Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Pension Plan [Member]
Service cost	$ 373	$ 338
Interest cost	3,609	3,570
Prior service cost	0	20
Expected return on plan assets	(4,283)	(4,240)
Amortization of transition obligation	38	38
Amortization of prior service cost (benefit)	35	(100)
Amortization of actuarial net loss	65	2,451
Modified mark-to market effect	0	(2,428)
Net periodic benefit income	(163)	(351)
Amortization of actuarial net loss	65	23
Service cost	373	340
Interest cost	3,609	3,571
Other Postretirement Benefits Plan [Member]
Service cost	8	10
Interest cost	191	213
Prior service cost	0	0
Expected return on plan assets	0	0
Amortization of transition obligation	0	0
Amortization of prior service cost (benefit)	(708)	(314)
Amortization of actuarial net loss	0	0
Modified mark-to market effect	0	0
Net periodic benefit income	(509)	(91)
Service cost	8	10
Interest cost	$ 191	$ 213