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Note H - Employee Benefit Plans - Defined Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair value of plan assets at beginning of year $ 129,348  
Fair value of plan assets at end of year 131,741 $ 129,348
Pension Plan [Member]    
Benefit obligation at beginning of year 198,586 189,807
Interest cost 4,674 5,894
Actuarial (gain) loss (6,610) 13,380
Benefits paid (10,609) (10,495)
Benefit obligation at end of year 186,041 198,586
Fair value of plan assets at beginning of year 129,348 118,092
Actual return on plan assets 10,977 11,014
Contributions 2,025 10,737
Benefits paid (10,609) (10,495)
Fair value of plan assets at end of year 131,741 129,348
Funded status at end of year $ (54,300) $ (69,238)