Note H - Employee Benefit Plans (Details Textual) - USD ($)		12 Months Ended
	Jan. 01, 2004	Jun. 30, 2023	Jun. 30, 2022
Health Insurance Plan Premium Expense		$ 1,700,000	$ 1,400,000
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount		$ 600,000	$ 300,000
Number of Years Compensation Used for Benefit Obligation Assumptions (Year)		5 years
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.89%	4.39%
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 0	$ 0
Defined Benefit Plan, Expected Amortization, Next Fiscal Year		$ 40,000
Large-cap Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		50.00%
Developed Market Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		26.00%
Mid-cap Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		18.00%
Small Cap Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		6.00%
Fixed Income Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		34.00%
Developed Market Fixed Income Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		66.00%
First Contributions [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		5.00%
Profit-sharing Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 700,000	500,000
Discretionary Profit-sharing Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 0	$ 300,000