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Significant Accounting Policies, Regulatory Assets and Liabilities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2025
USD ($)
ServiceLine
Dec. 31, 2024
USD ($)
Dec. 31, 2014
USD ($)
Assets [Abstract]      
Regulatory assets $ 59,297 $ 54,061  
Liabilities [Abstract]      
Regulatory liabilities 47,187 44,811  
Excess Accumulated Deferred Income Taxes on Accelerated Depreciation [Member]      
Liabilities [Abstract]      
Regulatory liabilities 12,907 13,090  
Postretirement Benefits [Member]      
Liabilities [Abstract]      
Regulatory liabilities 25,785 22,825  
Income Taxes [Member]      
Liabilities [Abstract]      
Regulatory liabilities $ 6,379 6,520  
Income Taxes [Member] | Minimum [Member]      
Liabilities [Abstract]      
Remaining recovery period 1 year    
Income Taxes [Member] | Maximum [Member]      
Liabilities [Abstract]      
Remaining recovery period 50 years    
IRS TPR Catch-Up Deduction [Member]      
Liabilities [Abstract]      
Regulatory liabilities $ 2,116 2,376 $ 3,887
Remaining recovery period 8 years    
Approved amortization period 15 years    
Income Taxes [Member]      
Assets [Abstract]      
Regulatory assets $ 47,186 40,880  
Unrealized Swap Losses [Member]      
Assets [Abstract]      
Regulatory assets $ 470 382  
Unrealized Swap Losses [Member] | Minimum [Member]      
Assets [Abstract]      
Remaining recovery period 1 year    
Unrealized Swap Losses [Member] | Maximum [Member]      
Assets [Abstract]      
Remaining recovery period 4 years    
Utility Plant Retirement Costs [Member]      
Assets [Abstract]      
Regulatory assets $ 8,955 10,221  
Remaining recovery period 5 years    
Customer-Owned Lead Service Line Replacements [Member]      
Assets [Abstract]      
Regulatory assets $ 1,016 1,173  
Number of lead customer-owned service lines to be replaced annually | ServiceLine 400    
Term of tariff modification to replace customer-owned lead service lines 9 years    
Customer-Owned Lead Service Line Replacements [Member] | Minimum [Member]      
Assets [Abstract]      
Remaining recovery period 1 year    
Customer-Owned Lead Service Line Replacements [Member] | Maximum [Member]      
Assets [Abstract]      
Remaining recovery period 4 years    
Income Taxes on Customers' Advances for Construction and Contributions in Aid of Construction [Member]      
Assets [Abstract]      
Regulatory assets $ 1,119 1,176  
Service Life Study Expenses [Member]      
Assets [Abstract]      
Regulatory assets $ 9 14  
Remaining recovery period 2 years    
Rate Case Filing Expenses [Member]      
Assets [Abstract]      
Regulatory assets $ 542 $ 215  
Rate Case Filing Expenses [Member] | Minimum [Member]      
Assets [Abstract]      
Remaining recovery period 1 year    
Rate Case Filing Expenses [Member] | Maximum [Member]      
Assets [Abstract]      
Remaining recovery period 4 years