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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Interest Rate Swap [Abstract]    
Term of debt on utilities rated A- used to discount prospective cash flows 30 years  
Reduction in the fair value of swap liability $ 21  
Fair Value Measurements [Abstract]    
Customers' advances for construction 12,820 $ 10,326
Note receivable 255 255
Fair Value on a Recurring Basis [Member]    
Interest Rate Swap [Abstract]    
Interest rate swap 2,086 2,731
Fair Value on a Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Interest Rate Swap [Abstract]    
Interest rate swap 2,086 2,731
Carrying Amount [Member]    
Fair Value, Financial Liabilities [Abstract]    
Total long-term debt 149,190 126,570
Estimated Fair Value [Member]    
Fair Value, Financial Liabilities [Abstract]    
Total long-term debt $ 168,000 $ 151,000