Note M - Pension and Other Postretirement Benefit Plans - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Pension Plan [Member]
Net income (loss)	$ 2,860	$ (12,460)
Amortization of transition asset	(40)	(40)
Amortization of prior service (cost) benefit	85	(47)
Amortization of net loss	(2,375)	(3,246)
Total recognized in other comprehensive income	530	(15,793)
Net periodic benefit cost (benefit)	299	1,977
Total recognized in net periodic benefit cost and other comprehensive income	829	(13,816)
Other Postretirement Benefits Plan [Member]
Net income (loss)	(785)	(397)
Amortization of transition asset	0	0
Amortization of prior service (cost) benefit	275	275
Amortization of net loss	0	0
Total recognized in other comprehensive income	(510)	(122)
Net periodic benefit cost (benefit)	(120)	(104)
Total recognized in net periodic benefit cost and other comprehensive income	$ (630)	$ (226)