Note H - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Expected Future Benefit Payment, Year One	$ 11,253
Defined Benefit Plan, Period Of Operating, History and Sufficient Trading Volume of Invested Entity (Year)	5 years
Defined Contribution Plan, Cost	$ 1,200
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	$ 10,545	$ 10,609
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	143,521	186,041
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	2,500
Qualified Plan II [Member] | Pension Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Year One	$ 1,600
Defined Benefit Plan, Amortization Period (Year)	25 years 7 months 6 days
Restoration Pension Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Benefits Paid	$ 1,800
Restoration Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	$ 21,000	$ 26,900
Qualified Plan I [Member] | Pension Plan [Member]
Defined Benefit Plan, Amortization Period (Year)	16 years 2 months 12 days