Note H - Components of Net Periodic Benefit Cost - Net Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest cost	$ 1,168	$ 1,473
Expected return on plan assets	(1,688)	(1,384)
Recognized actuarial loss	860	812
Net periodic benefit cost	$ 340	$ 901