Note M - Pension and Other Postretirement Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan, Cost of Premium for Health Coverage Plan, Percentage	100.00%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 79,549	$ 98,700
Defined Benefit Plan, Weighted Average Healthcare Cost, Trend Rate	5.75%	5.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Defined Benefit Plan, Expected Long-term Return on Plan Assets	6.13%
Defined Contribution Plan, Cost	$ 2,245	$ 2,162
Pension Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 612
UNITED STATES
Defined Benefit Plan, Expected Long-term Return on Plan Assets	6.40%
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	$ 890	$ 1,398
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	1.30%	1.50%