Note N - Pension and Other Postretirement Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2021
Defined Benefit Plan, Net Liability Expected Amount	$ 1,500
Defined Benefit Plan, Measured Amount	$ 2,600
Defined Benefit Plan, Cost of Premium for Health Coverage Plan, Percentage	100.00%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 68,110	$ 72,242
Defined Benefit Plan, Weighted Average Healthcare Cost, Trend Rate	8.30%		5.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Defined Contribution Plan, Cost	$ 2,447	$ 2,260
Pension Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	542
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 519
UNITED STATES
Defined Benefit Plan, Expected Long-term Return on Plan Assets		7.00%
Common Stock Held by U.S Pension Plans [Member]
Defined Benefit Plan, Plan Assets, Employer, Related Party, Number of Shares (in shares)	98,211	98,211
Defined Benefit Plan, Plan Assets, Employer, Related Party, Amount	$ 1,157	$ 1,106
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	1.80%	1.60%