Note H - Components of Net Periodic Benefit Cost - Net Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest cost	$ 1,473	$ 1,813	$ 2,946	$ 3,626
Expected return on plan assets	(1,384)	(1,111)	(2,768)	(2,222)
Recognized actuarial loss	812	733	1,624	1,466
Net periodic benefit cost	$ 901	$ 1,435	$ 1,802	$ 2,870