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Bank Borrowings and Long-Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 28, 2022	Apr. 06, 2022
Maine Water Company | 4.54% Note Due May 2042 | Notes Payable to Banks
Debt Instrument [Line Items]
Aggregate principal amount		$ 15,000
Interest rate		4.54%
Connecticut Water Company | 4.71% Senior Note, Series 2022, Due 2052 | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 25,000
Interest rate	4.71%

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