Note M - Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Pension Plan [Member]
Service cost	$ 511	$ 615
Interest cost	2,473	2,516
Prior service cost	40	65
Expected return on plan assets	(5,055)	(4,552)
Amortization of transition obligation	40	40
Amortization of prior service cost	(85)	47
Amortization of actuarial net loss	2,375	3,246
Net periodic benefit cost	299	1,977
Service cost	507	608
Interest cost	2,472	2,516
Other Postretirement Benefits Plan [Member]
Prior service cost	0	0
Amortization of prior service cost	(274)	(274)
Net periodic benefit cost	(120)	(104)
Service cost	14	16
Interest cost	$ 140	$ 154