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Income Taxes (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Position
Dec. 31, 2019
USD ($)
Dec. 31, 2017
Dec. 31, 2014
USD ($)
Provisions for Income Taxes [Abstract]        
Federal current $ 1,376 $ 1,148    
State current 554 451    
Federal deferred 247 475    
State deferred (120) 205    
Federal investment tax credit, net of current utilization (39) (39)    
Total income taxes 2,018 2,240    
Reconciliation of Statutory Federal Tax Provision to Total Provision [Abstract]        
Statutory Federal tax provision 3,909 3,495    
State income taxes, net of Federal benefit 426 574    
IRS TPR deduction (1,979) (1,642)    
Tax-exempt interest (29) (25)    
Amortization of investment tax credit (39) (39)    
Cash value of life insurance (110) 6    
Amortization of excess accumulated deferred income taxes on accelerated depreciation (182) (149)    
Other, net 22 20    
Total income taxes 2,018 2,240    
Regulatory Liabilities [Abstract]        
Regulatory liabilities $ 25,969 $ 25,399    
Federal corporate tax rate 21.00% 21.00% 34.00%  
Deferred Tax Assets [Abstract]        
Reserve for doubtful accounts $ 189 $ 88    
Compensated absences 151 148    
Deferred compensation 1,375 1,276    
Excess accumulated deferred income taxes on accelerated depreciation 3,995 4,047    
Deferred taxes associated with the gross-up of revenues necessary to return, in rates, the effect of temporary differences 2,456 2,104    
Customers' advances for construction and contributions in aid of construction 1,815 998    
Revenue reduction for tax rate change 0 7    
Tax effect of pension regulatory liability 7 0    
Other costs deducted for book, not for tax 64 69    
Total deferred tax assets 10,052 8,737    
Deferred Tax Liabilities [Abstract]        
Accelerated depreciation 29,893 28,891    
Basis differences from IRS TPR 13,671 11,311    
Investment tax credit 356 384    
Deferred taxes associated with the gross-up of revenues necessary to recover, in rates, the effect of temporary differences 8,088 6,987    
Pensions 638 525    
Tax effect of pension regulatory asset 0 106    
Unamortized debt issuance costs 500 531    
Other costs deducted for tax, not for book 444 428    
Total deferred tax liabilities 53,590 49,163    
Net deferred tax liability 43,538 40,426    
Valuation allowance 0 0    
Uncertain tax positions $ 0      
Open tax year 2017 2018 2019      
Number of new tax positions taken | Position 0      
Interest or penalties $ 0 0    
IRS TPR Catch-Up Deduction [Member]        
Regulatory Liabilities [Abstract]        
Regulatory liabilities $ 3,412 3,671   $ 3,887
Approved amortization period 15 years      
Amortization of catch-up deduction $ (259) (216)    
IRS TPR Ongoing Deductions [Member]        
Regulatory Liabilities [Abstract]        
Ongoing TPR deduction $ (1,720) $ (1,426)