Organization, Summary of Significant Accounting Policies and Recent Developments (Tables)

12 Months Ended

Dec. 31, 2020

Organization Summary Of Significant Accounting Policies And Recent Developments [Abstract]

Range 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%

Allowance for Funds Used During Construction Rates

	2020	2019	2018
Middlesex	6.50%	6.50%	6.50%
Tidewater	7.92%	7.92%	7.92%

Schedule of Operating Revenues

	(In Thousands)
	Years Ended December 31,
	2020			2019			2018
Regulated Tariff Sales
Residential	$	76,798		$	71,487		$	69,785
Commercial		15,448			15,198			14,844
Industrial		9,512			9,390			10,183
Fire Protection		12,374			12,291			12,099
Wholesale		15,187			14,319			14,655
Non-Regulated Contract Operations		12,130			11,773			16,374
Total Revenue from Contracts with Customers	$	141,449		$	134,458		$	137,940
Other Regulated Revenues		532			393			335
Other Non-Regulated Revenues		415			404			404
Inter-segment Elimination		(804	)		(657	)		(602	)
Total Revenue	$	141,592		$	134,598		$	138,077