Note H - Employee Benefit Plans - Weighted-average Assumptions Used for Measurement of Defined Pension Plans (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Qualified Plan I [Member]
Weighted-average assumptions used to determine net periodic benefit cost	2.75%	2.37%
Expected return on plan assets	4.25%	5.50%
Weighted-average assumptions used to determine benefit obligations, discount rate	5.13%	2.75%
Qualified Plan II [Member]
Weighted-average assumptions used to determine net periodic benefit cost	2.92%
Expected return on plan assets	5.75%
Weighted-average assumptions used to determine benefit obligations, discount rate	5.18%	2.92%
Restoration Plan [Member]
Weighted-average assumptions used to determine net periodic benefit cost	2.73%	2.34%
Weighted-average assumptions used to determine benefit obligations, discount rate	5.12%	2.73%