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Short-Term Borrowings (Details) - Schedule of Credit Lines and the Weighted Average Interest Rates - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	May 31, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule of Credit Lines and the Weighted Average Interest Rates [Abstract]
Average Daily Amounts Outstanding		$ 62,934	$ 24,220	$ 56,463	$ 36,848
Weighted Average Interest Rates	2.00%	6.43%	6.09%	6.42%	5.75%

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- References

No definition available.

+ Details

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Namespace Prefix:	msex_
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Balance Type:	na
Period Type:	duration

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- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

The effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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