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Commitments and Contingent Liabilities (Details) - Schedule of operating lease ROU assets - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Operating Lease Rou Assets Abstract |  |
ROU Asset at Lease Inception | $ 7.3 | $ 7.3
Accumulated Amortization | (3.5) | (2.8)
Current ROU Asset | $ 3.8 | $ 4.5

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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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- Definition Accumulated amortization on ROU. + References No definition available. + Details
Name: | msex_RightOfUseAssetsAccumulatedAmortization
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Right of use of assets current. + References No definition available. + Details
Name: | msex_RightOfUseAssetsCurrent
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | msex_ScheduleOfOperatingLeaseRouAssetsAbstract
Namespace Prefix: | msex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration