Note H - Employee Benefit Plans (Details Textual) - USD ($)		12 Months Ended
	Jan. 01, 2004	Jun. 30, 2021	Jun. 30, 2020
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 400,000	$ 300,000
Health Insurance Plan Premium Expense		1,200,000	$ 1,400,000
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount		$ 1,500,000
Number of Years Compensation Used for Benefit Obligation Assumptions (Year)		5 years
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		2.74%	2.45%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 7,000
Defined Benefit Plan, Plan Assets, Contributions by Employer		7,000	$ 0
Defined Benefit Plan, Expected Amortization, Next Fiscal Year, Total		$ 34,000
Large-cap Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		83.00%
Developed Market Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		10.00%
Emerging Markets Equity Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		7.00%
Fixed Income Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		52.00%
Developed Market Fixed Income Funds [Member]
Defined Benefit Plan Equity Securities by Type, Percentage		48.00%
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	3.00%
Next Contributions [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	2.00%