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Short-Term Borrowings (Details) - Schedule of information regarding short-term borrowings - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule Of Information Regarding Short Term Borrowings Abstract
Average Amount Outstanding	$ 54,561	$ 13,444
Weighted Average Interest Rate at Year-End	5.52%	1.12%

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- References

No definition available.

+ Details

Name:	msex_ScheduleOfInformationRegardingShortTermBorrowingsAbstract
Namespace Prefix:	msex_
Data Type:	xbrli:stringItemType
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

Name:	us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Balance Type:	na
Period Type:	instant