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Note 18 - Pension and Postretirement Benefits (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy $ 800,000 $ 800,000    
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 0      
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy $ 75,800 $ 58,200 $ 48,500  
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 50.00%     50.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 45.80% 52.50%    
Debt Securities [Member]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 50.00%     50.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 47.80% 40.00%    
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 $ 700,000 $ 700,000    
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 1,400,000      
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 7.75%      
Defined Benefit Plan Ultimate Health Care Cost Decreasing Trend Rate 4.50%      
Pension Plan and SERP Plan [Member]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligations, Expected Return On Plan Assets 6.25% 6.50%    
Pension Plan [Member] | Equity Securities [Member]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   55.00%    
Pension Plan [Member] | Debt Securities [Member]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   45.00%