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Commitments and Contingent Liabilities - Schedule of Operating Lease ROU Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Schedule of Operating Lease ROU Assets [Abstract] |  |
ROU Asset at Lease Inception | $ 7,300 | $ 7,300
Accumulated Amortization | (4,700) | (4,100)
Current ROU Asset | $ 2,567 | $ 3,185

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- Definition Represents the amount of operating lease accumulated amortization. + References No definition available. + Details
Name: | msex_OperatingLeaseRightOfUseAssetAccumulatedAmortization
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Right of use asset at lease inception. + References No definition available. + Details
Name: | msex_RightOfUseAssetAtLeaseInception
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeaseCostAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant