Note E - Leases (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020	Jul. 01, 2019
Operating Lease, Right-of-Use Asset	$ 16,551	$ 18,354
Operating Lease, Weighted Average Remaining Lease Term (Year)	6 years 182 days	7 years 73 days
Operating Lease, Weighted Average Discount Rate, Percent	3.24%	3.24%
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 20,700
Operating Lease, Liability, Total			$ 20,900