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Note 18 - Pension and Postretirement Benefits (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2023
Dec. 31, 2019
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy $ 1,000,000 $ 800,000      
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 7.75%        
Defined Benefit Plan Ultimate Health Care Cost Decreasing Trend Rate 4.50%        
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy $ 118,100 $ 80,700 $ 75,800    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00%        
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 100.00% 100.00%      
Equity Securities [Member]          
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 40.00% 45.00%   40.00%  
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 40.00% 41.40%      
Debt Securities [Member]          
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 60.00% 55.00%   60.00%  
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 53.50% 52.90%      
Debt Securities [Member] | Veba [Member]          
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage   100.00%     100.00%
Pension Plan And Supplemental Cash Balance Plan [Member]          
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy $ 1,700,000 $ 800,000      
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 1,000,000        
Pension Plan and SERP Plan [Member]          
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets 6.25% 6.25% 6.50%