Note N - 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, 2025	Jun. 30, 2024
Pension Plan [Member]
Net loss	$ 2,487	$ 1,656
Amortization of transition asset	(43)	(38)
Amortization of prior service benefit	(27)	(34)
Amortization of net (income) loss	(985)	(64)
Total recognized in other comprehensive income	1,432	1,520
Net periodic benefit cost (income)	1,409	(163)
Total recognized in net periodic benefit cost (income) and other comprehensive income	2,841	1,357
Other Postretirement Benefits Plan [Member]
Net loss	34	(165)
Amortization of transition asset	0	0
Amortization of prior service benefit	0	88
Amortization of net (income) loss	262	620
Total recognized in other comprehensive income	296	543
Net periodic benefit cost (income)	(90)	(509)
Total recognized in net periodic benefit cost (income) and other comprehensive income	$ 206	$ 34