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Note 5 - Retirement Plans - Pension Plan Asset Allocation (Details)
Dec. 31, 2023
Dec. 31, 2022
Asset allocation percentage 100.00% 100.00%
Defined Benefit Plan, Equity Securities [Member]    
Asset allocation percentage 24.00% 48.00%
Defined Benefit Plan, Equity Securities [Member] | Minimum [Member]    
Target Allocation 20.00%  
Defined Benefit Plan, Equity Securities [Member] | Maximum [Member]    
Target Allocation 30.00%  
Defined Benefit Plan, Debt Security [Member]    
Asset allocation percentage 75.00% 51.00%
Defined Benefit Plan, Debt Security [Member] | Minimum [Member]    
Target Allocation 70.00%  
Defined Benefit Plan, Debt Security [Member] | Maximum [Member]    
Target Allocation 80.00%  
Defined Benefit Plan, Real Estate [Member]    
Asset allocation percentage 1.00% 1.00%
Defined Benefit Plan, Real Estate [Member] | Minimum [Member]    
Target Allocation 0.00%  
Defined Benefit Plan, Real Estate [Member] | Maximum [Member]    
Target Allocation 2.00%