Note E - Leases (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jul. 01, 2019
Operating Lease, Right-of-Use Asset	$ 17,696	$ 18,354
Operating Lease, Weighted Average Remaining Lease Term (Year)	7 years	7 years 73 days
Operating Lease, Weighted Average Discount Rate, Percent	3.25%	3.24%
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 20,700
Operating Lease, Liability, Total			$ 20,900