Note I - Pension and Other Post-retirement Benefit Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Plan [Member]
Service cost	$ 0	$ 0
Interest cost	6,614	8,631
Expected return on plan assets	(8,122)	(10,192)
Amortization of net loss	2,594	4,745
Net periodic benefit cost (income)	1,086	3,184
Postretirement Health Coverage [Member]
Service cost	5	13
Interest cost	23	33
Expected return on plan assets	0	0
Amortization of net loss	(23)	0
Net periodic benefit cost (income)	$ 5	$ 46