Note O - Employee and Director Benefit Plans - Assumptions (Details) - Other Postretirement Benefits Plan [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equivalent APBO Single Discount Rate	5.00%	5.20%
Current Pre 65 Health Care Trend Rate	8.35%	6.50%	8.64%	5.50%
Current Post 64 Health Care Trend Rate-Non Grandfathered	5.38%	6.50%	5.32%	5.50%
Current Post 64 Health Care Trend Rate-Granfathered	7.23%	6.50%	7.35%	5.50%
Ultimate Health Care Trend Rate	4.59%	4.56%
Year Ultimate Trend Rate Reached	2042	2041
Equivalent APBO Single Discount Rate			5.20%	2.80%
Current Pre 65 Health Care Trend Rate	8.35%	6.50%	8.64%	5.50%
Current Post 64 Health Care Trend Rate-Non Grandfathered	5.38%	6.50%	5.32%	5.50%
Current Post 64 Health Care Trend Rate-Grandfathered	7.23%	6.50%	7.35%	5.50%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.20%	4.59%	4.50%
Year Ultimate Trend Rate Reached			2042	2026