Note E - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
Operating Lease, Weighted Average Remaining Lease Term (Year)	5 years 9 months 18 days		5 years 9 months 18 days		6 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	3.24%		3.24%		3.24%
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0	$ 0	$ 0	$ 0