Note D - Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating lease cost	$ 2,365	$ 2,215
Amortization of right-of-use assets	67	64
Interest on lease liabilities	14	19
Total Finance lease cost	81	83
Variable lease cost	920	537
Total lease cost	3,366	2,835
Operating cash flows from operating leases	4,526	4,285
Operating cash flows from finance leases	14	22
Financing cash flows from finance leases	$ 110	$ 101
Weighted Average Remaining Lease term, Operating leases (Year)	3 years 36 days	3 years 182 days
Weighted Average Remaining Lease term, Finance leases (Year)	3 years 36 days	3 years 109 days
Weighted Average Discount Rate, Operating leases	4.68%	4.71%
Weighted Average Discount Rate, Finance leases	6.48%	7.16%