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Note H - Employee Benefit Plans (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Expected Future Benefit Payment, Year One $ 10,973  
Defined Benefit Plan, Period Of Operating, History and Sufficient Trading Volume of Invested Entity (Year) 5 years  
Minimum [Member]    
Defined Benefit Plan, Period to Meet Goals (Year) 3 years  
Maximum [Member]    
Defined Benefit Plan, Period to Meet Goals (Year) 5 years  
Pension Plan [Member]    
Defined Benefit Plan, Plan Assets, Benefits Paid $ 10,609 $ 10,495
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation 186,041 198,586
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year 6,600  
Qualified Plan II [Member] | Pension Plan [Member]    
Defined Benefit Plan, Expected Future Benefit Payment, Year One $ 1,300  
Defined Benefit Plan, Amortization Period (Year) 27 years 1 month 6 days  
Restoration Pension Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan, Plan Assets, Benefits Paid $ 1,700  
Restoration Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation $ 26,900 $ 28,700
Qualified Plan I [Member] | Pension Plan [Member]    
Defined Benefit Plan, Amortization Period (Year) 17 years 4 months 24 days