Note O - Employee and Director Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Gain	$ 357	$ (1,013)	$ 229
Other Postretirement Benefits Plan [Member]
Net Gain	1,518	1,701
Prior Service Credit	363	537
Total	$ 1,881	$ 2,238