Note 5 - Employee Benefit Plans (Details Textual) - USD ($)	2 Months Ended	12 Months Ended
	Feb. 17, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Expected rate of return on plan assets	7.25%	7.25%	6.40%
Defined Benefit Plan Assumed Long Term Rate Basis Spread		1.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 10,330,000	$ 22,250,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		55.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		5.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 600,000	500,000	$ 10,000
Capital Accumulation 401(K) Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 4,500,000	4,300,000	4,600,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		6.00%
Pension plans
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 5,500,000	5,500,000
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		4,200,000	16,800,000
Nonoperating Income (Expense) [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Except Service cost		$ (5,400,000)	$ 600,000	$ 2,900,000