Note D - Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating lease cost	$ 2,119	$ 2,365
Amortization of right-of-use assets	49	67
Interest on lease liabilities	7	14
Total Finance lease cost	56	81
Variable lease cost	920	920
Sublease income	(171)
Total lease cost, net	2,924	3,366
Operating cash flows from operating leases	3,950	4,526
Operating cash flows from finance leases	7	14
Financing cash flows from finance leases	$ 56	$ 110
Weighted Average Remaining Lease term, Operating leases (Year)	5 years 292 days	3 years 36 days
Weighted Average Remaining Lease term, Finance leases (Year)	2 years 292 days	3 years 36 days
Weighted Average Discount Rate, Operating leases	3.58%	4.68%
Weighted Average Discount Rate, Finance leases	5.30%	6.48%