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Commitments and Contingent Liabilities (Details) - Schedule of Purchased Water Costs - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule of Purchased Water Costs [Abstract]
Treated	$ 992	$ 1,363	$ 1,901	$ 2,747
Untreated	861	739	1,711	1,540
Total Costs	$ 1,853	$ 2,102	$ 3,612	$ 4,287

X

- Definition

Refers to cost of treated water during the period.

+ References

No definition available.

+ Details

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

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- Definition

Refers to cost of untreated water during the period.

+ References

No definition available.

+ Details

Name:	msex_CostOfUntreatedWater
Namespace Prefix:	msex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Cost of water purchased, may include any water related assessment. If water is bought on a unit volume basis, would also be considered as commodity costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

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- References

No definition available.

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