Note H - Components of Net Periodic Benefit Cost - Net Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest cost	$ 1,473	$ 1,813	$ 4,419	$ 5,439
Expected return on plan assets	(1,384)	(1,111)	(4,152)	(3,333)
Recognized actuarial loss	812	732	2,436	2,197
Net periodic benefit cost	$ 901	$ 1,434	$ 2,703	$ 4,303