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Note 8 - Benefit Plans (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
yr
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plans Number of Plans 2    
Defined Benefit Plans Retirement Age (Year) | yr 65    
Defined Benefit Plan, Termination Charge $ 7,821 $ 0 $ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total (15,108) (14,361)  
Other Assets [Member] | Nonqualified Plan [Member]      
Cash Surrender Value of Life Insurance 7,900 5,000  
Other Noncurrent Liabilities [Member] | Nonqualified Plan [Member]      
Deferred Compensation Liability, Classified, Noncurrent, Total 7,800 4,800  
Noncontributory Qualified Defined Pension Plans [Member]      
Defined Benefit Plan, Benefit Obligation, Payment for Settlement 14,300    
Defined Benefit Plan, Termination Charge 7,800    
Defined Benefit Plan, Remaining Undistributed Asset Surplus 400    
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 (15,523) (14,337)  
Defined Benefit Plan, Expected Amortization, Next Fiscal Year, Total 1,700    
Postretirement Life Insurance [Member]      
Cash Surrender Value of Life Insurance 4,600 4,000  
Postretirement Life Insurance [Member] | Life Insurance Contracts [Member]      
Gain (Loss) on Investments, Total $ 600 500 700
401(K) Plan [Member}      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 25.00%    
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 1,600   1,600
Defined Contribution Plan, Increase (Decrease), Cost     $ (1,200)
Gain (loss) on Employer Matching Contribution, Amount   $ 300