Note I - Pension and Other Post-retirement Benefit Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Plan [Member]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	6,614	8,631	13,228	17,262
Expected return on plan assets	(8,122)	(10,192)	(16,244)	(20,384)
Amortization of net loss	2,594	4,745	5,188	9,490
Net periodic benefit cost (income)	1,086	3,184	2,172	6,368
Postretirement Health Coverage [Member]
Service cost	5	13	10	26
Interest cost	23	33	46	66
Expected return on plan assets	0	0	0	0
Amortization of net loss	(24)	0	(47)	0
Net periodic benefit cost (income)	$ 4	$ 46	$ 9	$ 92