Note D - Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost	$ 8,646	$ 9,251
Amortization of right-of-use assets	240	298
Interest on lease liabilities	45	70
Total Finance lease cost	285	368
Variable lease cost	3,085	2,797
Sublease income	(470)
Total lease cost, net	11,546	12,416
Operating cash flows from operating leases	18,777	17,986
Operating cash flows from finance leases	40	66
Financing cash flows from finance leases	$ 412	$ 807
Weighted Average Remaining Lease term, Operating leases (Year)	6 years 18 days	3 years 105 days
Weighted Average Remaining Lease term, Finance leases (Year)	2 years 354 days	3 years 54 days
Weighted Average Discount Rate, Operating leases	3.72%	4.71%
Weighted Average Discount Rate, Finance leases	6.74%	7.44%