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Note O - Employee and Director Benefit Plans - Assumptions (Details) - Other Postretirement Benefits Plan [Member]
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equivalent APBO Single Discount Rate 2.50% 3.20%
Current Pre 65 Health Care Trend Rate 5.75% 6.00%
Current Post 64 Health Care Trend Rate 5.75% 6.00%
Ultimate Health Care Trend Rate 4.50% 4.50%
Year Ultimate Trend Rate Reached 2026 2026
Equivalent APBO Single Discount Rate 3.20% 4.30%
Current Pre 65 Health Care Trend Rate 0.06 0.0625
Current Post 64 Health Care Trend Rate 0.06 0.0625
Ultimate Health Care Trend Rate 4.50% 4.50%
Year Ultimate Trend Rate Reached 2026 2026