CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 18,445us-gaap_NetIncomeLoss	$ 16,633us-gaap_NetIncomeLoss	$ 14,396us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and Amortization	12,191	11,858	11,232
Provision for Deferred Income Taxes and Investment Tax Credits	3,130us-gaap_DeferredIncomeTaxExpenseBenefit	2,915us-gaap_DeferredIncomeTaxExpenseBenefit	3,959us-gaap_DeferredIncomeTaxExpenseBenefit
Equity Portion of Allowance for Funds Used During Construction (AFUDC)	(207)	(201)	(309)
Cash Surrender Value of Life Insurance	(108)	(226)	(151)
Stock Compensation Expense	539us-gaap_ShareBasedCompensation	493us-gaap_ShareBasedCompensation	553us-gaap_ShareBasedCompensation
Changes in Assets and Liabilities:
Accounts Receivable	1,950	1,201	2,441
Unbilled Revenues	(285)	(169)	(641)
Materials & Supplies	(269)	(581)	620
Prepayments	(261)	527	(633)
Accounts Payable	26	2,520	(1,898)
Accrued Taxes	816	(1,134)	1,419
Accrued Interest	(17)	196	(673)
Employee Benefit Plans	(3,243)	(1,140)	270
Unearned Revenue & Advanced Service Fees	2	81	22
Other Assets and Liabilities	(138)	832	(1,035)
NET CASH PROVIDED BY OPERATING ACTIVITIES	32,571	33,805	29,572
CASH FLOWS FROM INVESTING ACTIVITIES:
Utility Plant Expenditures, Including AFUDC of $110 in 2014, $113 in 2013 and $175 in 2012	(22,596)	(20,080)	(21,578)
Restricted Cash	(100)	323	464
Distribution From/(Investment In) Joint Venture	857	(1,655)	(1,200)
NET CASH USED IN INVESTING ACTIVITIES	(21,839)	(21,412)	(22,314)
CASH FLOWS FROM FINANCING ACTIVITIES:
Redemption of Long-term Debt	(5,481)us-gaap_RepaymentsOfLongTermDebt	(11,230)us-gaap_RepaymentsOfLongTermDebt	(56,725)us-gaap_RepaymentsOfLongTermDebt
Proceeds from Issuance of Long-term Debt	12,246	4,045	60,350
Net Short-term Bank Borrowings	(9,450)	500	3,700
Deferred Debt Issuance Expense	(141)us-gaap_PaymentsOfDebtIssuanceCosts	(57)us-gaap_PaymentsOfDebtIssuanceCosts	(1,160)us-gaap_PaymentsOfDebtIssuanceCosts
Premium on Long-term Debt			2,236msex_PremiumOnLongtermDebt
Restricted Cash		6,070	(6,223)
Proceeds from Issuance of Common Stock	1,493	1,368	1,587
Payment of Common Dividends	(12,231)us-gaap_PaymentsOfDividendsCommonStock	(11,943)us-gaap_PaymentsOfDividendsCommonStock	(11,679)us-gaap_PaymentsOfDividendsCommonStock
Payment of Preferred Dividends	(151)	(190)	(206)
Construction Advances and Contributions-Net	822	853	781
NET CASH USED IN FINANCING ACTIVITIES	(12,893)	(10,584)	(7,339)
NET CHANGES IN CASH AND CASH EQUIVALENTS	(2,161)	1,809	(81)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	4,834	3,025	3,106
CASH AND CASH EQUIVALENTS AT END OF PERIOD	2,673	4,834	3,025
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITY:
Utility Plant received as Construction Advances and Contributions	6,598us-gaap_ContributionOfProperty	3,176us-gaap_ContributionOfProperty	1,015us-gaap_ContributionOfProperty
Long-term Debt Deobligation		64msex_DeobligatedPrincipalPayments	255msex_DeobligatedPrincipalPayments
Cash Paid During the Year for:
Interest	5,745us-gaap_InterestPaidNet	5,743us-gaap_InterestPaidNet	7,537us-gaap_InterestPaidNet
Interest Capitalized	110us-gaap_InterestPaidCapitalized	113us-gaap_InterestPaidCapitalized	175us-gaap_InterestPaidCapitalized
Income Taxes	$ 5,903us-gaap_IncomeTaxesPaidNet	$ 7,009us-gaap_IncomeTaxesPaidNet	$ 2,349us-gaap_IncomeTaxesPaidNet

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

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The cash outflow for the purchase of a facility and equipment that provides water supply which includes wells, reservoirs, pumping stations, and control facilities; and waste water systems which includes the waste treatment and disposal facility and equipment to households and industry.

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The cash inflow from developers, builders, governmental agencies and municipalities that provide the entity with cash to extend its construction services to their properties.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or outflow from cash and cash items that are not available for withdrawal or usage.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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