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Significant Accounting Policies, Utility Plant and Depreciation (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
System
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Abstract]    
Number of wastewater collection systems operated | System 2  
Number of wastewater collection and treatment systems operated | System 2  
Utility Plant and Depreciation [Abstract]    
Utility plant acquisition adjustments $ 3,318 $ 3,108
Amortization of utility plant acquisition adjustments 61 58
Utility plant $ 401,383 $ 380,784
Effective rate of depreciation 2.29% 2.21%
Mains and Accessories [Member]    
Utility Plant and Depreciation [Abstract]    
Utility plant $ 200,954 $ 190,679
Mains and Accessories [Member] | Minimum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 11 years  
Mains and Accessories [Member] | Maximum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 86 years  
Services, Meters and Hydrants [Member]    
Utility Plant and Depreciation [Abstract]    
Utility plant $ 77,501 74,178
Services, Meters and Hydrants [Member] | Minimum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 17 years  
Services, Meters and Hydrants [Member] | Maximum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 51 years  
Operations Structures, Reservoirs and Water Tanks [Member]    
Utility Plant and Depreciation [Abstract]    
Utility plant $ 63,530 61,868
Operations Structures, Reservoirs and Water Tanks [Member] | Minimum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 10 years  
Operations Structures, Reservoirs and Water Tanks [Member] | Maximum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 58 years  
Pumping and Treatment Equipment [Member]    
Utility Plant and Depreciation [Abstract]    
Utility plant $ 33,124 32,575
Pumping and Treatment Equipment [Member] | Minimum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 7 years  
Pumping and Treatment Equipment [Member] | Maximum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 30 years  
Office, Transportation and Operating Equipment [Member]    
Utility Plant and Depreciation [Abstract]    
Utility plant $ 14,464 13,531
Office, Transportation and Operating Equipment [Member] | Minimum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 3 years  
Office, Transportation and Operating Equipment [Member] | Maximum [Member]    
Utility Plant and Depreciation [Abstract]    
Remaining life 23 years  
Land and Other Non-Depreciable Assets [Member]    
Utility Plant and Depreciation [Abstract]    
Utility plant $ 3,393 3,202
Utility Plant in Service [Member]    
Utility Plant and Depreciation [Abstract]    
Utility plant 392,966 376,033
Construction Work in Progress [Member]    
Utility Plant and Depreciation [Abstract]    
Utility plant $ 8,417 $ 4,751