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Organization, Summary of Significant Accounting Policies and Recent Developments (Tables)
 12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]  
Schedule of depreciation rates
Source of Supply 1.15% -   3.44% Transmission and Distribution (T&D):
Pumping 2.00% -   5.39% T&D – Mains 1.10%  -   3.13%
Water Treatment 1.65% -   7.09% T&D – Services 2.12%  -   3.16%
General Plant 2.08% - 17.84% T&D – Other 1.61%  -   4.63%
Wastewater Collection 1.42% -   1.81%    

 
Schedule of allowance for funds used during construction rates
   2022  2021  2020
Middlesex   6.35%   6.50%   6.50%
Tidewater   7.92%   7.92%   7.92%

 
Schedule of operating revenues
   (In Thousands)
   Years Ended December 31,
   2022  2021  2020
Regulated Tariff Sales               
Residential  $84,950   $77,699   $76,798 
Commercial   22,689    16,715    15,448 
Industrial   11,152    8,990    9,512 
Fire Protection   12,726    12,608    12,374 
Wholesale   18,769    14,590    15,187 
Non-Regulated Contract Operations   12,006    12,391    12,130 
Total Revenue from Contracts with Customers  $162,292   $142,993   $141,449 
Other Regulated Revenues   831    929    532 
Other Non-Regulated Revenues   440    427    415 
Inter-segment Elimination   (1,129)   (1,208)   (804)
Total Revenue  $162,434   $143,141   $141,592