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Note 10 - Benefit Plans (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
yr
Dec. 31, 2021
USD ($)
Defined Benefit Plans Number of Plans 2  
Defined Benefit Plans Retirement Age (Year) | yr 65  
Defined Benefit Plan, Termination Charge $ 0 $ 7,821
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total   (15,108)
Other Assets [Member] | Nonqualified Plan [Member]    
Cash Surrender Value of Life Insurance 7,700 7,900
Other Noncurrent Liabilities [Member] | Nonqualified Plan [Member]    
Deferred Compensation Liability, Classified, Noncurrent, Total 7,700 7,800
Noncontributory Qualified Defined Pension Plans [Member]    
Defined Benefit Plan, Benefit Obligation, Payment for Settlement   14,300
Defined Benefit Plan, Termination Charge   7,800
Noncontributory Qualified Defined Pension Plans [Member] | Annuitization Benefit [Member]    
Guaranteed Benefit Liability, Net, Ending Balance   3,100
Supplemental Employee Retirement Plan [Member]    
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total (12,993) (15,523)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year, Total 200  
Postretirement Life Insurance [Member]    
Cash Surrender Value of Life Insurance 3,900 4,600
Postretirement Life Insurance [Member] | Life Insurance Contracts [Member]    
Gain (Loss) on Investments, Total (800) $ 600
401(K) Plan [Member}    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   25.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 600 $ 1,600