Purchased Water: Utilities Operating Expense [Abstract] Materials and Supplies Increase (Decrease) in Raw Materials, Packaging Materials and Supplies Inventories TOTAL CAPITALIZATION Capitalization, Long-Term Debt and Equity Schedule of Short-Term Borrowings Schedule of Short-Term Debt [Table Text Block] Expected Return on Plan Assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Allowance for funds used during construction rates Public Utilities, Allowance for Funds Used During Construction, Rate Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Number of entities approved for corporate reorganization Public Utilities, Approved Corporate Reorganization, Number Of Entities Public Utilities, Approved Corporate Reorganization, Number Of Entities Tabular List, Table Tabular List [Table Text Block] Target Allocation, Percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Debt Securities Agency/US Debt Debt Securities [Member] Measurement Basis [Axis] Measurement Basis [Axis] Employee Benefit Plans Employee Benefit Plans Employee Benefit Plans. Adjustment to Compensation: Adjustment to Compensation [Axis] Lawsuit Settlement Lawsuit Settlement [Member] Lawsuit Settlement LSLR Lead Service Line Replacement Plan [Member] Lead Service Line Replacement Plan Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Rates and Regulatory Matters Public Utilities Disclosure [Text Block] Maximum number of shares petitioned to issue and sell during offering (in shares) Sale Of Stock, Maximum Number Of Shares Issuable In Future Transaction Sale Of Stock, Maximum Number Of Shares Issuable In Future Transaction Payment of Preferred Dividends Payments of Ordinary Dividends, Preferred Stock and Preference Stock Stock, Class of Stock [Table] Stock, Class of Stock [Table] Defined Benefit Plan, Plan Assets, Category [Table] Defined Benefit Plan, Plan Assets, Category [Table] Restricted Stock Award - Net - Employees (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Plan Pension Plan [Member] Weighted Average Interest Rate Short-Term Debt, Weighted Average Interest Rate, over Time Principles of Consolidation Consolidation, Policy [Policy Text Block] Stock Compensation Expense Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] % Effective Income Tax Rate Reconciliation, Percent [Abstract] Cash Dividends on Common Stock Dividends, Common Stock, Cash Balance at beginning of period Balance at end of period Equity, Attributable to Parent System of Accounts System Of Accounts, Policy [Policy Text Block] Disclosure of accounting policy for system of accounts. Insider Trading Policies and Procedures [Line Items] Common stock authorized (in shares) Common Stock, Shares Authorized At-The-Market Program Common Stock Issuance (in shares) Stock Issued During Period, Shares, New Issues Nonredeemable Preferred Stock $7.00 Series Nonredeemable Preferred Stock, $7.00 Series [Member] Nonredeemable Preferred Stock, $7.00 Series CAPITALIZATION AND LIABILITIES Liabilities and Equity [Abstract] State and Local Jurisdiction State and Local Jurisdiction [Member] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Long-term Debt: Long-Term Debt, Unclassified [Abstract] Benefit Obligation Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Restricted Stock Units Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before Income Taxes Earnings from continuing operations, before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Regulatory Asset [Line Items] Regulatory Asset [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Schedule of Paid Income taxes Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Table] Line of Credit Facility [Table] Short-Term Debt [Abstract] Short-Term Debt [Abstract] Less Current Portion Operating Lease, Liability, Current Transmission and Distribution Public Utilities, Property, Plant and Equipment, Transmission and Distribution Document Fiscal Period Focus Document Fiscal Period Focus Benefit Cost Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Award Timing Method Award Timing Method [Text Block] Award Type Award Type [Axis] Audit Information [Abstract] Audit Information Utility Plant [Domain] Utility Plant [Domain] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Entity Address, City or Town Entity Address, City or Town Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] TOTAL Public Utilities, Property, Plant and Equipment, Plant in Service Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Net Short-term Bank Borrowings Proceeds from (Repayments of) Short-Term Debt Commercial Commercial Customers [Member] Commercial Customers Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Regulatory Agency [Axis] Regulatory Agency [Axis] Entity Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year One Common stock outstanding (in shares) Balance at beginning of period (in shares) Balance at end of period (in shares) Common Stock, Shares, Outstanding Discount Rate for: Defined Benefit Plan, Weighted Average Assumptions Used In Calculating Discount Rate [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used In Calculating Discount Rate Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) New Jersey Revenue Taxes New Jersey Revenue Taxes [Member] New Jersey Revenue Taxes Schedule of Operating Revenues Disaggregation of Revenue [Table Text Block] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Accrued Taxes Accrued Income Taxes, Current Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Period for approved recovery of costs Approved Recovery Of Costs, Period Approved Recovery Of Costs, Period Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Convertible Preferred $7.00 Series Dividend (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Income Taxes Total Income Tax Expense Consolidated Income Taxes Income Tax Expense (Benefit) Shares Authorized Preferred Stock, Value Authorized Preferred stock value authorized. TOTAL OTHER ASSETS Other Assets Preferred stock issued (in shares) Cumulative preferred stock, Nonredeemable shares issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Contributions exceeding rate Threshold Percentage Of Participants Compensation At Which Matching Decreases Threshold Percentage Of Participants Compensation At Which Matching Decreases Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Unearned Compensation, Vested Share-Based Compensation Arrangement By Share-Based Payment Award, Vested, Unearned Compensation The grant-date value of unearned compensation for awards vested. Discretionary contribution Defined Contribution Plan, Employer Discretionary Contribution Amount Regulatory Accounting Regulatory Income Taxes, Policy [Policy Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Other Regulatory Assets Other Regulatory Assets [Member] Other Regulatory Assets Federal taxes Paid Income Tax Paid, Federal, after Refund Received All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Accrued Interest Accrued Liabilities, Current Preferred Stock Dividend Requirements Preferred Dividend Preferred Stock Dividends, Income Statement Impact Other Adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Schedule of Fair Value of Plan Assets Defined Benefit Plan, Plan Assets, Category [Table Text Block] Accumulated Benefit Obligation for Pension Plan Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] NET CASH PROVIDED BY OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Estimated useful lives Property, Plant and Equipment, Useful Life Subsequent Event Subsequent Event [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Purchase Commitment, Excluding Long-Term Commitment [Axis] Purchase Commitment, Excluding Long-Term Commitment [Axis] Depreciation Consolidated Depreciation Depreciation Money Market Funds Money Market Funds [Member] Defined Benefit Plan, Roll Forwards [Abstract] Defined Benefit Plan, Roll Forwards [Abstract] Cumulative Preferred Stock, No Par Value: Cumulative Preferred Stock No Par Value [Abstract] Cumulative Preferred Stock No Par Value Equity Components [Axis] Equity Components [Axis] Stock Award - Board Of Directors Stock Issued During Period, Value, Restricted Stock Award, Gross Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Refund of excess deferred income taxes Deferred Income Taxes, Required Refund Amount Deferred Income Taxes, Required Refund Amount Regulatory Liabilities Regulatory Liability, Noncurrent Entity Address, State or Province Entity Address, State or Province 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Regulatory Liabilities Regulatory Liability [Abstract] Earnings Applicable to Common Stock (in Shares) Weighted Average Limited Partnership Units Outstanding, Diluted TOTAL CURRENT LIABILITIES Liabilities, Current Stock Award - Board Of Directors (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Individual: Individual [Axis] Matching contributions Defined Contribution Plan, Cost Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Return on equity Public Utilities, Approved Return on Equity, Percentage Payment of Common Dividends Payments of Ordinary Dividends, Common Stock Document Annual Report Document Annual Report Customer Advances Deferred Tax Liabilities, Customer Advances Deferred Tax Liabilities, Customer Advances 5.99% FMBs due 2055 5.99% First Mortgage Bonds Due 2055 [Member] 5.99% First Mortgage Bonds Due 2055 Advances for Construction Advances For Construction, Policy [Policy Text Block] Advances for Construction Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Investment Tax Credits Deferred Other Tax Expense (Benefit) Redemption of Long-term Debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current Mutual Funds Mutual Fund [Member] Funded Status Defined Benefit Plan, Funded (Unfunded) Status of Plan Revenues Revenue from Contract with Customer [Policy Text Block] Treated Cost Of Treated Water Refers to cost of treated water during the period. Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Shares converted (in shares) Convertible Preferred Stock, Shares Issued upon Conversion DEPSC Delaware Public Service Commission [Member] Delaware Public Service Commission Nonredeemable Preferred Stock $4.75 Series Nonredeemable Preferred Stock, $4.75 Series [Member] Nonredeemable Preferred Stock, $4.75 Series 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Schedule of Table Presents Awarded but not Yet Vested Share Share-Based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Other Other Assets, Noncurrent Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of Long-Term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Operating Revenues Total Revenue Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Defined Benefit Plan [Table] Defined Benefit Plan [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Unearned Revenues and Advanced Service Fees Contract with Customer, Liability, Current Nontaxable or Nondeductible Items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount [Abstract] Materials and Supplies (at average cost) Inventory, Raw Materials and Supplies, Gross Schedule of Allocation of Plan Assets [Line Items] Defined Benefit Plan, Plan Assets, Allocation [Line Items] Compensation Increase for: Defined Benefit Plan, Weighted Average Assumptions Used In Calculating Rate Of Compensation Increase [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used In Calculating Rate Of Compensation Increase Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] CAPITALIZATION: Capitalization, Long-Term Debt and Equity [Abstract] Benefits Paid Defined Benefit Plan, Benefit Obligation, Benefits Paid U.S Federal Statutory Tax Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Unamortized Balances Regulatory Assets And Liabilities [Table Text Block] Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. Long-term Debt TOTAL LONG-TERM DEBT Long-Term Debt, Excluding Current Maturities Depreciation Depreciation, Depletion, and Amortization [Policy Text Block] Advances for Construction Construction Payable Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Acquisition of Water Systems Payments to Acquire Water Systems Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Conversion of $7 Preferred Stock to Common Stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Effect on Current Year Service and Interest Costs, Decrease Defined Benefit Plan, Effect of One-Percentage-Point Decrease on Service and Interest Cost Components Fair Value as of Grant Date Award Grant Date Fair Value Award forfeiture period upon termination of employment Share-Based Compensation Arrangement By Share-Based Payment Award, Forfeiture Upon Employment Termination, Period Share-Based Compensation Arrangement By Share-Based Payment Award, Forfeiture Upon Employment Termination, Period Depreciation: Depreciation [Abstract] Accumulated Amortization Operating Lease, Right-Of-Use Asset, Accumulated Amortization Represents the amount of operating lease accumulated amortization. Granted shares (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Maximum petitioned borrowing amount approved Debt Instrument, Maximum Face Amount Approved To Borrow Debt Instrument, Maximum Face Amount Approved To Borrow Estimated incremental borrowing rate Estimated Incremental Borrowing Rate Estimated incremental borrowing rate. Provision for Deferred Income Taxes and Investment Tax Credits Deferred Income Taxes and Tax Credits FMBs Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Refund credited amount Public Utilities, Approved Rate, Refund Credit Amount Public Utilities, Approved Rate, Refund Credit Amount Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Other Operations and Maintenance Expenses: Utilities Operating Expense, Maintenance and Operations [Abstract] Non-PEO NEO Non-PEO NEO [Member] Noncurrent Asset Pension And Other Postretirement Defined Benefit Plan, Noncurrent Assets Pension And Other Postretirement Defined Benefit Plan, Noncurrent Assets Transmission and distribution rate Public Utilities Property Plant And Equipment, Rate Of Transmission And Distribution Transmission and distribution. Sale of Stock [Axis] Sale of Stock [Axis] Award Type [Domain] Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Other Taxes: Taxes, Miscellaneous [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Employee Benefit Plans [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Underwritten Public Offering and/or ATM Offering Over-Allotment Option And/Or At-The-Market Offering [Member] Over-Allotment Option And/Or At-The-Market Offering Retirement Plan Type [Domain] Retirement Plan Type [Domain] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Revenues: Revenues [Abstract] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Middlesex Middlesex Water Company [Member] Middlesex Water Company General Plant General Plant [Member] General Plant 2026 Long-Term Debt, Maturity, Year One Utility Plant Utility, Revenue and Expense Recognition, Policy [Policy Text Block] 2030 Long-Term Debt, Maturity, Year Five Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Minimum Minimum Minimum [Member] Expected Return on Plan Assets for: Defined Benefit Plan, Weighted Average Assumptions Used In Calculating Expected Long-Term Rate Of Return On Plan Assets [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used In Calculating Expected Long-Term Rate Of Return On Plan Assets Middlesex And Pinelands Customers Middlesex Water Company, Pinelands Water Company And Pinelands Wastewater Company Customers [Member] Middlesex Water Company, Pinelands Water Company And Pinelands Wastewater Company Customers Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Purchase Commitment, Excluding Long-Term Commitment [Domain] Purchase Commitment, Excluding Long-Term Commitment [Domain] Accounts Payable Accounts Payable, Current Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Water Production Public Utilities, Property, Plant and Equipment, Generation or Processing Earnings Applicable to Common Stock, Diluted Earnings Applicable to Common Stock Net Income (Loss) Available to Common Stockholders, Diluted Commitments and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] MDL Settlement Multi-District Litigation Settlement [Member] Multi-District Litigation Settlement Regulated Operation, Regulatory Asset [Table] Regulated Operation, Regulatory Asset [Table] Diluted (in shares) Adjusted Earnings Applicable to Common Stock (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted Average Interest Rate Short-Term Debt, Weighted Average Interest Rate, at Point in Time Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Liability for Future Policy Benefit, Activity [Line Items] Liability for Future Policy Benefit, Activity [Line Items] Entity Small Business Entity Small Business ATM Equity Sales Agreement At-The-Market Equity Offering [Member] At-The-Market Equity Offering Common Stock Issuance Expense Payments of Stock Issuance Costs Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Cumulative preferred stock, price (in dollars per share) Convertible preferred stock, conversion price (in dollars per share) Preferred Stock, Convertible, Conversion Price Schedule of Employee Benefit Plans Recognized in Balance Sheet Schedule of Changes in Projected Benefit Obligations [Table Text Block] Preferred stock outstanding (in shares) Cumulative preferred stock, Nonredeemable shares outstanding (in shares) Preferred Stock, Shares Outstanding State Current State and Local Tax Expense (Benefit) Document Transition Report Document Transition Report Number of customers served Asset Acquisition, Number Of Customers Served Number Of Customers Serviced Shares Outstanding Preferred Stock, Value, Outstanding Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] Document Period End Date Document Period End Date Average purchase of gallons a day under agreement (in mgd) Purchase Obligation, Volume Per Day The average purchase of gallons. Income Taxes Income Tax Disclosure [Text Block] Add: Premium on Issuance of Long-term Debt Debt Instrument, Unamortized Premium Allowance for credit losses Accounts Receivable, Allowance for Credit Loss Amount spent to identify and inventory lead service lines Payment For Requested Recovery Of Costs Cost Related To Requested Returns Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Document Type Document Type Outstanding at January 1, 2022 (in shares) Outstanding at December 31 , 2025 (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Level 3 Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Product and Service [Axis] Product and Service [Axis] Asset Acquisition [Domain] Asset Acquisition [Domain] Total Revenue from Contracts with Customers Revenue from Contract with Customer, Excluding Assessed Tax Less Accumulated Depreciation Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Acquisition of assets Asset Acquisition, Consideration Transferred TOTAL CURRENT ASSETS Assets, Current Refunded CAC Payment for Advance for Construction, Financing Activity Statistical Measurement [Axis] Statistical Measurement [Axis] Regulatory Asset [Domain] Regulatory Asset [Domain] Amortizing Secured Notes Amortizing Secured Notes [Member] Amortizing Secured Notes Convertible Preferred $7.00 Series Dividend Convertible Preferred Dividends, Net of Tax Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Payment of Grantee Withholding Taxes in Exchange for Restricted Stock Payment, Tax Withholding, Share-Based Payment Arrangement Other Benefits Plan Other Benefits Plan [Member] Other Benefits Plan Pumping Pumping [Member] Pumping Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Earnings Applicable to Common Stock, Basic Earnings Applicable to Common Stock Net Income (Loss) Available to Common Stockholders, Basic CURRENT LIABILITIES: Liabilities, Current [Abstract] Rate and Regulatory Matters (Details) [Line Items] Rate and Regulatory Matters (Details) [Line Items] Rate and Regulatory Matters (Details) [Line Items] Total Operating Expenses Operating Expenses Level 1 Fair Value, Inputs, Level 1 [Member] Regulated Tariff-Based Services Regulated Tariff-Based Services [Member] Regulated Tariff-Based Water And Wastewater Utility Services Accrued Interest Increase (Decrease) in Accrued Liabilities Diluted (in dollars per share) Diluted EPS (in dollars per share) Earnings Per Share, Diluted Accounts Receivable, net of allowance for credit losses of $1,625 and $2,695, respectively in 2025 and 2024 Accounts Receivable, after Allowance for Credit Loss, Current Defined Benefit Plan, Plan Assets, Allocation [Table] Defined Benefit Plan, Plan Assets, Allocation [Table] Preferred stock converted into common shares (in shares) Preferred Stock, Convertible, Shares Issuable Schedule of Discount and Compensation Rates Defined Benefit Plan, Assumptions [Table Text Block] Cash Dividends on Preferred Stock Dividends, Preferred Stock, Cash Number of shares issued and sold under agreement (in shares) Sale of Stock, Number of Shares Issued in Transaction Dividend Reinvestment & Common Stock Purchase Plan Stock Issued During Period, Value, Dividend Reinvestment Plan Total State Taxes Paid Income Tax Paid, State and Local, after Refund Received Consolidation Items [Domain] Consolidation Items [Domain] Auditor Location Auditor Location Prepayments Increase (Decrease) in Prepaid Expense Water Treatment Water Treatment [Member] Water Treatment Maximum value of costs to be recovered Requested Recovery Of Costs, Maximum, Amount Requested Recovery Of Costs, Maximum, Amount Actuarial (Gain) Loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Regulatory Liability [Domain] Regulatory Liability [Domain] UTILITY PLANT: Public Utilities, Property, Plant and Equipment, Net [Abstract] Imputed Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Adjusted Earnings Applicable to Common Stock Net Income (Loss) Available To Common Stockholders, Diluted, Adjusted Represents the amount of adjusted earnings applicable to common stock. PNC Bank PNC Bank Committed Line Of Credit [Member] PNC Bank [Member] Total Income Taxes Paid Income Taxes Income Taxes Paid, Net Corporate Bonds Corporate Bond Securities [Member] Middlesex and Pinelands Middlesex Water Company, Pinelands Water Company And Pinelands Wastewater Company [Member] Middlesex Water Company, Pinelands Water Company And Pinelands Wastewater Company SUBTOTAL LONG-TERM DEBT Long-Term Debt, Gross Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Total Lease Payments Lessee, Operating Lease, Liability, to be Paid Fire Protection Fire Protection Customers [Member] Fire-Protection Customers Industrial Industrial Customers [Member] Industrial Customers Schedule of AFUDC Rates for Middlesex and Tidewater Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] New Jersey SRF New Jersey State Revolving Fund [Member] New Jersey State Revolving Fund Inter-segment Elimination Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Percentage of shares available for issuance Percentage Of Shares Available For Issuance Percentage of shares available for issuance. Schedule of Regulatory Assets into Net Periodic Benefit Cost Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Net Asset Recognized Pension And Other Postretirement Defined Benefit Plan, Net Asset Recognized Pension And Other Postretirement Defined Benefit Plan, Net Asset Recognized Common Stock, No Par Value Common Stock No Par Value [Abstract] Common Stock No Par Value Schedule of Purchased Water Costs Purchase Commitment, Excluding Long-Term Commitment [Table Text Block] Net Income: Net Income (Loss) Attributable to Parent [Abstract] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts Receivable Increase (Decrease) in Accounts Receivable Treated Water Treated Water [Member] Treated Water Residential Residential Customers [Member] Residential Customers Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] U.S Federal Statutory Tax Rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Debt repaid Repayments of Debt State Taxes, Net of Federal Income Tax Effect State corporate net income tax rates Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Average Amount Outstanding Line of Credit Facility, Average Outstanding Amount Totals Defined Benefit Plan, Accumulated Benefit Obligation Proceeds from Issuance of Long-term Debt Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Benefits plan assumed annual rate Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Convertible Preferred Stock $7.00 Series Convertible Preferred Stock [Member] Maximum number of shares authorized for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Size of elevated storage tank (in gallons) Projects Funded By Debt Instruments, Storage Volume Of Project Projects Funded By Debt Instruments, Storage Volume Of Project Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Servicing Liabilities at Fair Value [Line Items] Servicing Liabilities at Fair Value [Line Items] Allowance for Funds Used During Construction (AFUDC) Allowance for Funds Used During Construction, Policy [Policy Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Litigation Settlement Payable Litigation Settlements Payable The amount of litigation settlement payable. 2027 Long-Term Debt, Maturity, Year Two Common Stock Issuance Expenses Stock Issued During Period, Issuance Costs Amount of common stock issuance expenses. Regulated Operation, Jointly Owned Utility Plant [Table] Regulated Operation, Jointly Owned Utility Plant [Table] NET CASH PROVIDED BY FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Schedule of Range of Depreciation Rates for the Major Utility Plant Categories Schedule of Jointly Owned Utility Plants [Table Text Block] Tidewater Customers Tidewater Utilities, Inc. Customers [Member] Tidewater Utilities, Inc. Customers Organization, Summary of Significant Accounting Policies and Recent Developments Basis of Presentation and Significant Accounting Policies [Text Block] Untreated Cost Of Untreated Water Refers to cost of untreated water during the period. Restricted Stock Award - Net - Employees Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Servicing Liability at Fair Value, Activity [Table] Servicing Liability at Fair Value, Activity [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Wastewater Collection Wastewater Collection [Member] Wastewater Collection Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Public Utilities, General Disclosures [Line Items] Public Utilities, General Disclosures [Line Items] Entity Tax Identification Number Entity Tax Identification Number Actuarial Loss (Gain) Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items] Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items] Organization, Summary Of Significant Accounting Policies And Recent Developments Asset Acquisition [Axis] Asset Acquisition [Axis] Capital Expenditures: Segment Reporting Information, Additional Information [Abstract] Schedule of Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] Schedule of Allocation of Plan Assets Defined Benefit Plan, Plan Assets, Allocation [Table Text Block] Common stock issued (in shares) Common Stock, Shares, Issued 2029 Long-Term Debt, Maturity, Year Four Entity Public Float Entity Public Float Interest Charges Consolidated Interest Charges Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Security Exchange Name Security Exchange Name Other Benefits Plan Other Pension Plan [Member] Preferred stock dividends Dividends, Preferred Stock Aggregate lines of credit Maximum Line of Credit Facility, Maximum Borrowing Capacity Dividend Reinvestment & Common Stock Purchase Plan (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] CONTRIBUTIONS IN AID OF CONSTRUCTION Contributions in Aid of Construction Prepayments Prepaid Expense, Current Operating Expenses: Operating Expenses [Abstract] Other Other Liabilities, Current Benefit Cost Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and Cash Equivalents Cash and Cash Equivalent Shares Authorized Common Stock, Value Authorized Common stock value authorized. Common Stock Common Stock [Member] Tangible Property Repairs Effective Income Tax Rate Reconciliation, Tangible Property Repairs, Amount The amount of income tax reconciliation tangible property repairs. Notes Payable Notes Payable at Year-End Notes Payable, Current Cash dividends on Common Stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Statistical Measurement [Domain] Statistical Measurement [Domain] Weighted average interest rate Long-Term Debt, Weighted Average Interest Rate, at Point in Time Effect on Current Year Service and Interest Costs, Increase Defined Benefit Plan, Effect of One-Percentage-Point Increase on Service and Interest Cost Components Basic: Earnings Per Share, Basic [Abstract] Weighted average price per share of shares issued and sold under agreement (in dollars per share) Sale Of Stock, Weighted Average Price Per Share Sale Of Stock, Weighted Average Price Per Share Effect on Projected Benefit Obligation, Decrease Defined Benefit Plan, Effect of One-Percentage-Point Decrease on Accumulated Postretirement Benefit Obligation Accounts Payable Increase (Decrease) in Accounts Payable Employees plan Number Of Hours Required To Participate In Contribution Plan Number Of Hours Required To Participate In Contribution Plan Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic (in dollars per share) Basic EPS (in dollars per share) Earnings Per Share, Basic Schedule of Lines of Credit Schedule of Line of Credit Facilities [Table Text Block] Number of shares approved to issue and sell (in shares) Common Stock, Capital Shares Reserved for Future Issuance Number of unit condominium community entity provides water service to Water Service Provided, Number Of Units In Condominium Community Water Service Provided, Number Of Units In Condominium Community Benefit Obligation Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Unbilled Revenues Unbilled Receivables, Current Schedule of Inter-Segment Transactions Schedule of Segment Reporting Information, by Segment [Table Text Block] Outstanding Short-Term Debt Direct Operating Costs [Abstract] Direct Operating Costs [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Customer Advances Deferred Tax Assets, Customer Advances Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived customer advances. Cash Cash and Cash Equivalents [Member] Convertible preferred shares available to convert (in shares) Preferred Stock, Convertible, Conversion Ratio Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] CURRENT ASSETS: Assets, Current [Abstract] TOTAL CAPITALIZATION AND LIABILITIES Liabilities and Equity Other Deferred Tax Assets, Other Capital Expenditures: Segment, Expenditure, Addition to Long-Lived Assets Approved recovery of costs Approved Recovery Of Costs, Amount Approved Recovery Of Costs, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Public Utility [Axis] Public Utility [Axis] Unearned Compensation, Granted Share-Based Compensation Arrangement By Share-Based Payment Award, Granted, Unearned Compensation The grant-date value of unearned compensation. Schedule of Future Minimum Operating Lease Commitments Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Pay vs Performance Disclosure [Line Items] Southern Shores Southern Shores Water Company, LLC [Member] Southern Shores Water Company, LLC Present Value of Lease Payments Operating Lease, Liability Depreciation and Amortization Depreciation, Depletion and Amortization, Nonproduction Other Other Liabilities, Noncurrent Unearned Compensation, Amortization of Compensation expense Share-Based Compensation Arrangement By Share-Based Payment Award, Amortization Of Unearned Compensation Amortization of compensation expense - unearned compensation. Percentage of operating revenues Percentage Of Operating Revenues Percentage of operating revenues. Utility Plant Expenditures, Including AFUDC-Debt of $641 in 2025, $511 in 2024 and $975 in 2023 Payment For Utility Plant Capital Expenditures Payment For Utility Plant Capital Expenditures Less: Current Portion of Long-term Debt Long-Term Debt, Current Maturities Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Employer Contributions Defined Benefit Plan, Plan Assets, Contributions by Employer 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Name Measure Name Secured Debt Secured Debt [Member] Class of Stock [Line Items] Class of Stock [Line Items] Accumulated Deferred Income Taxes Deferred Income Tax Liabilities, Net Benefit Cost Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Non-utility Assets - Net Non-Utility Assets, Net, Noncurrent Represents the amount of non-utility assets - net. Nontaxable or Nondeductible Items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation and Amortization, Percent [Abstract] Accrued Taxes Increase (Decrease) in Accrued Taxes Payable Pinelands Wastewater Pinelands Wastewater Company [Member] Pinelands Wastewater Company Carrying amount of debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] TOTAL ASSETS Consolidated Assets Assets Regulatory Liability [Axis] Regulatory Liability [Axis] TOTAL COMMON STOCKHOLDERS’ EQUITY Partners' Capital Income Taxes Income Tax, Policy [Policy Text Block] CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Consolidated Other Operations and Maintenance Expenses Utilities Operating Expense, Maintenance And Operations, Other Utilities Operating Expense, Maintenance And Operations, Other Compensation plus rate Percent Of Participants Contributions Matched By Company, Above 1% Of Participants Compensation Percent Of Participants Contributions Matched By Company, Above 1% Of Participants Compensation Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Employee Benefit Plans Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] State Taxes, Net of Federal Income Tax Effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Short-term Borrowings Short-Term Debt [Text Block] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] CoBank, ACB (CoBank) CoBank, ACB Committed Line Of Credit [Member] CoBank, ACB Committed Line Of Credit Amortizing Secured Notes And State Revolving Trust Notes Amortizing Secured Notes And State Revolving Trust Notes [Member] Amortizing Secured Notes And State Revolving Trust Notes Investment Plan Middlesex Water Company Investment Plan [Member] Middlesex Water Company Investment Plan Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] NJBPU New Jersey Board Of Public Utilities [Member] New Jersey Board Of Public Utilities [Member] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITY: Noncash Investing and Financing Items [Abstract] Income Tax Paid, by Individual Jurisdiction [Line Items] Income Tax Paid, by Individual Jurisdiction [Line Items] Changes in Assets and Liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Utility Plant Related Deferred Tax Liabilities, Property, Plant and Equipment Other Non-Regulated Revenues Unregulated Operating Revenue, Other Represent the amount of other non regulated revenues. Interest Expense: Interest Expense, Nonoperating [Abstract] Retained Earnings Retained Earnings [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Convertible preferred stock per shares (in dollars per share) Preferred Stock, Dividends, Per Share, Cash Paid Sale of Stock [Domain] Sale of Stock [Domain] Pinewood Acres Water Utility Assets Pinewood Acres Water Utility Assets [Member] Pinewood Acres Water Utility Assets Regulated Regulated Segment [Member] Regulated [Member] Product and Service [Domain] Product and Service [Domain] ROU Asset at Lease Inception Operating Lease, Right-Of-Use Asset, Lease Inception Right of use asset at lease inception. Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Income Tax Paid, by Individual Jurisdiction [Table] Income Tax Paid, by Individual Jurisdiction [Table] Equity Portion of Allowance for Funds Used During Construction (AFUDC) Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Defined Benefit Plan, Plan Assets, Category [Line Items] Defined Benefit Plan, Plan Assets, Category [Line Items] Total Accumulated Deferred Income Taxes Deferred Tax Liabilities, Net CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Amortization of Net Actuarial Loss (Gain) Defined Benefit Plan, Amortization of Gain (Loss) Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] TOTAL OTHER LIABILITIES Other Liabilities Increase in annual operating revenues Public Utilities, Approved Rate Increase (Decrease), Percentage Schedule of Operating Lease ROU Assets Lease, Cost [Table Text Block] Number of quarterly dividends in arrears triggering election of members to Board of Directors Preferred Stock, Threshold Number Of Quarterly Dividends In Arrears Triggering Board Of Directors Election Preferred Stock, Threshold Number Of Quarterly Dividends In Arrears Triggering Board Of Directors Election Federal Deferred Federal Income Tax Expense (Benefit) Cash Defined Benefit Plan, Cash [Member] Utility Plant Related Effective Income Tax Rate Reconciliation, Disposition of Asset, Percent Auditor Name Auditor Name Construction Work in Progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Other Performance Measure, Amount Other Performance Measure, Amount Deferred Debt Issuance Expense Payments of Debt Issuance Costs Retirement Benefit Plans Pension and Other Postretirement Plans, Policy [Policy Text Block] May 2024 Delaware SRF May 2024 Delaware State Revolving Fund [Member] May 2024 Delaware State Revolving Fund $ Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] NET CHANGES IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Common Shares Outstanding: Assets, Average Outstanding [Abstract] Benefits Paid Defined Benefit Plan, Plan Assets, Benefits Paid Entity [Domain] Entity [Domain] NET CASH USED IN INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Interest Interest Paid, Excluding Capitalized Interest, Operating Activity DSIC Distribution System Improvement Charge [Member] Distribution System Improvement Charge Foundational Filing Percentage of total assets Percentage Of Total Assets Percentage of total assets. Document Fiscal Year Focus Document Fiscal Year Focus Organization Basis of Accounting, Policy [Policy Text Block] Operating Lease Right of Use Asset Current ROU Asset Operating Lease, Right-of-Use Asset Total Income Tax Expense Effective tax rate Effective Income Tax Rate Reconciliation, Percent Expenditures for operating leases Operating Lease, Cost Wholesale Wholesale Customers [Member] Wholesale Customers Carrying Amount Reported Value Measurement [Member] Plan Name [Domain] Plan Name [Domain] Equity [Abstract] Equity [Abstract] Estimated future expenditure obligation Purchase Obligation Business Segment Data Segment Reporting Disclosure [Text Block] Proceeds from Litigation Settlement, net Proceeds From Litigation Settlement, Net The amount of proceeds from litigation settlement, net. Government Treasury US Treasury Securities [Member] Average purchase of gallons Average Purchase Of Gallons The average purchase of gallons. Schedule of Employee Benefit Plans Recognized in Balance Sheet Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Beginning Balance Ending Balance Total Investments Defined Benefit Plan, Plan Assets, Amount Federal Current Federal Tax Expense (Benefit) Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Approved increase in annual operating revenues Public Utilities, Approved Rate Increase (Decrease), Amount Accrued Payables for Utility Plant Accrued Payables For Utility Plant The amount of accrued payables for utility plant. Schedule of Components of Net Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Aggregate gross sales price Sale of Stock, Consideration Received on Transaction Accounts Receivable Accounts Receivable [Policy Text Block] Average Number of Average Number Of Abstract Average Number Of Abstract Arrangement Duration Trading Arrangement Duration Contributions plan rate Percent Of Participants Contributions Matched By Company, Below 1% Of Participants Compensation Percent Of Participants Contributions Matched By Company, Below 1% Of Participants Compensation General Public Utilities, Property, Plant and Equipment, Common Segments [Axis] Segments [Axis] Shares, Amortization of Compensation expense (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Other Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Thereafter Long-Term Debt, Maturity, after Year Five Total Costs Consolidated Purchased Water Cost of Purchased Water Source of Supply Source Of Supply [Member] Source Of Supply ASSETS Assets [Abstract] Number of shares authorized (in Shares) Excess Stock, Shares Authorized Utility Plant Related Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Number of Board of Directors members entitled to elect upon quarterly dividends in arrears trigger Number Of Board Of Directors Member Elections Entitled To Preferred Shareholders Upon Quarterly Dividends In Arrears Trigger Number Of Board Of Directors Member Elections Entitled To Preferred Shareholders Upon Quarterly Dividends In Arrears Trigger Employee Benefit Plans Retirement Benefits [Text Block] Outstanding convertible stock, percentage Percentage Of Stock That May Be Redeemed In Given Calendar Year Percentage of stock that may be redeemed in a given calendar year. Allowance for Funds Used During Construction Public Utilities, Allowance for Funds Used During Construction, Additions Interest rate Debt Instrument, Interest Rate, Stated Percentage Lease Obligations Non-Current Lease Liability Operating Lease, Liability, Noncurrent Entity Voluntary Filers Entity Voluntary Filers PWAC Purchased Water Adjustment Clause [Member] Purchased Water Adjustment Clause Maximum percentage of costs to be recovered Requested Recovery Of Costs, Maximum, Percentage Requested Recovery Of Costs, Maximum, Percentage Registrant Name Entity Registrant Name Non – Regulated Non-Regulated Segment [Member] Non - Regulated [Member] Income Taxes Income Taxes [Member] Income Taxes Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net Periodic Benefit (Gain) Cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other Taxes Consolidated Other Taxes Taxes, Other Regulated Operations [Abstract] Regulated Operations [Abstract] Cash Paid During Period [Abstract] Cash Paid During Period [Abstract] Cash Paid During Period State Taxes Paid-Other State and Local Tax Jurisdiction, Other [Member] Regulatory Asset Regulatory Asset [Abstract] State Revolving Trust Notes State Revolving Trust Notes [Member] State Revolving Trust Notes [Member] Shares, Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted Cost of Removal Cost Of Removal [Member] Cost Of Removal Tangible Property Repairs Effective Income Tax Rate Reconciliation, Tangible Property Repairs, Percent Effective Income Tax Rate Reconciliation, Tangible Property Repairs, Percent Weighted Average Granted Price, Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Interest Cost Defined Benefit Plan, Interest Cost Restatement Determination Date: Restatement Determination Date [Axis] Income Taxes: Income Tax Expense (Benefit), Continuing Operations [Abstract] Recovered Costs Litigation Settlement Increase (Decrease) In Recovered Costs Environmental Litigation Settlement Recovered Costs-Environmental Litigation Settlement amount increase (decrease). Construction Advances and Contributions-Net Proceeds from (Payment for) Other Financing Activity Rate and Regulatory Matters (Details) [Table] Rate and Regulatory Matters (Details) [Table] Rate and Regulatory Matters (Details) [Table] Tidewater Tidewater Utilities, Inc. [Member] Tidewater Utilities, Inc. Regulatory Asset [Axis] Regulatory Asset [Axis] Name Trading Arrangement, Individual Name Schedule of Change in Fair Value of Plan Assets Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Short-Term Debt [Table] Short-Term Debt [Table] Borrowing amount Debt Instrument, Face Amount Construction Advances Construction Advances [Member] Construction Advances Preferred Stock Preferred Stock [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Construction Agreement Construction Agreement [Member] Construction Agreement Restricted Cash Restricted Cash, Noncurrent Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Regulatory Assets Regulatory Asset, Noncurrent ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Matching contributions, percent Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay RESIC Resiliency And Environmental System Improvement Charge [Member] Resiliency And Environmental System Improvement Charge Foundational Filing Conversion of $7 Preferred Stock to Common Stock Stock Issued During Period, Value, Conversion of Convertible Securities Capital cost of covered healthcare benefits Increase (Decrease) In Annual Rate Per Capita, Cost Of Covered Healthcare Benefits, 2046 Increase (Decrease) In Annual Rate Per Capita, Cost Of Covered Healthcare Benefits, 2046 Number of active construction projects funded by debt instruments Number Of Projects Funded By Debt Instruments Number Of Projects Funded By Debt Instruments Auditor Firm ID Auditor Firm ID Segments [Domain] Segments [Domain] Available Line of Credit Facility, Remaining Borrowing Capacity Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Beginning Balance Ending Balance Defined Benefit Plan, Benefit Obligation Investment Tax Credits Deferred Tax Liabilities, Investments Schedule of Issued Accounting Standards Accounting Standards Update and Change in Accounting Principle [Table Text Block] OTHER ASSETS: Assets, Noncurrent [Abstract] Operating Income: Operating Income (Loss) [Abstract] Preferred Stock, No Par Value, authorized 120, 13 and 16 outstanding in 2025 and 2024, respectively TOTAL PREFERRED STOCK Preferred Stock, Value, Issued Aggregate gross sales price of shares remaining to be issued under agreement Sale Of Stock, Remaining Consideration Receivable On Transaction Sale Of Stock, Remaining Consideration Receivable On Transaction New Jersey Board Of Public Utilities Treated Water Agreement New Jersey Board Of Public Utilities Treated Water Agreement [Member] New Jersey Board Of Public Utilities Treated Water Agreement All Executive Categories All Executive Categories [Member] Schedule of Deferred Income Taxes Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Common Stock, No Par Value, authorized 40,000, 18,521 and 17,887 outstanding in 2025 and 2024, respectively Common Stock, Value, Issued COMMITMENTS AND CONTINGENT LIABILITIES (Note 4) Commitments and Contingencies Loans Payable Loans Payable [Member] Outside Director Stock Compensation Plan Outside Director Stock Compensation Plan [Member] Outside Director Stock Compensation Plan State Taxes Paid-Delaware DELAWARE Short-Term Debt [Line Items] Short-Term Debt [Line Items] December 2025 Delaware SRF December 2025 Delaware State Revolving Fund [Member] December 2025 Delaware State Revolving Fund PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Actual Allocation, Percentage Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Diluted: Earnings Per Share, Diluted [Abstract] Stock based compensation remain award rate Stock Based Compensation, Remaining Award Rate Stock based compensation remain award rate. Proceeds from Issuance of Common Stock Proceeds from Issuance of Common Stock 2030 Defined Benefit Plan, Expected Future Benefit Payment, Year Five All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Unearned Compensation, Outstanding at January 1, 2022 Unearned Compensation, Outstanding at December 31 , 2024 Share-Based Compensation Arrangement By Share-Based Payment Award, Outstanding, Unearned Compensation The weighted average grant-date fair value of unearned compensation granted during the reporting period. Name Forgone Recovery, Individual Name Regulatory Agency [Domain] Regulatory Agency [Domain] AFUDC-Debt utility plant expenditures Interest Capitalized Interest Paid, Capitalized, Investing Activity Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] 2023 Delaware SRF 2023 Delaware State Revolving Fund [Member] 2023 Delaware State Revolving Fund Conversion of Preferred Stock Into Common Stock Preferred Stock Conversions, Inducements Common Equity Securities Defined Benefit Plan, Equity Securities [Member] Liability for Future Policy Benefit Activity [Table] Liability for Future Policy Benefit Activity [Table] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Employee Benefits Deferred Tax Liabilities, Employee Benefits Deferred Tax Liabilities, Employee Benefits Bank of America Bank Of America Uncommitted Line Of Credit [Member] Bank of America [Member] Other Assets and Liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Convertible preferred stock no par value (in dollars per share) Preferred Stock, No Par Value Composite depreciation rate for plants in service Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security SUPPLEMENTAL DISCLOSURE OF CASH FLOWS INFORMATION: Income Taxes Paid, Net [Abstract] Earnings per share of Common Stock: Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Total Other Income, net Consolidated Other Income, Net Nonoperating Income (Expense) Increase declining annual rate Increase (Decrease) In Annual Rate Per Capita, Cost Of Covered Healthcare Benefits, Through 2046 Increase (Decrease) In Annual Rate Per Capita, Cost Of Covered Healthcare Benefits, Through 2046 Unearned Revenue and Advanced Service Fees Increase (Decrease) in Contract with Customer, Liability Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Sovereign/Non-US Debt Debt Security, Corporate, Non-US [Member] Effect on Projected Benefit Obligation, Increase Defined Benefit Plan, Effect of One-Percentage-Point Increase on Accumulated Postretirement Benefit Obligation September 2024 Delaware SRF September 2024 Delaware State Revolving Fund [Member] Delaware State Revolving Fund Town of Ocean View Water Utility Assets Town Of Ocean View Water Utility Assets [Member] Town of Ocean View, Delaware Water Utility Assets Award Timing Disclosures [Line Items] Service Cost Defined Benefit Plan, Service Cost Pinelands Water Pinelands Water Company [Member] Pinelands Water Company Shares, Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Exercised Capitalization Equity [Text Block] State Deferred State and Local Income Tax Expense (Benefit) Schedule of Carrying Amount and Fair Value of the Bonds Schedule of Capitalization [Table Text Block] Net Income Net Income Consolidated Net Income Net Income (Loss) Attributable to Parent OTHER LIABILITIES: Liabilities, Noncurrent [Abstract] UTILITY PLANT - NET Public Utilities, Property, Plant and Equipment, Net New Jersey Water Supply Authority Untreated Water Agreement New Jersey Water Supply Authority Untreated Water Agreement [Member] New Jersey Water Supply Authority Agreement Schedule of Reconciliation Of Income Taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Other Adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock authorized (in shares) Cumulative preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date Customer [Axis] Customer [Axis] Operating Income Consolidated Operating Income Operating Income (Loss) Line of Credit Line of Credit [Member] Retained Earnings Retained Earnings (Accumulated Deficit) Refund of interest on excess deferred income taxes Interest On Deferred Income Taxes, Required Refund Amount Interest On Deferred Income Taxes, Required Refund Amount Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Cash Surrender Value of Life Insurance Life Insurance, Corporate or Bank Owned, Change in Value Class of Stock [Axis] Class of Stock [Axis] Compensation eligible rate Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Other Deferred Tax Liabilities, Other Retirement Plan Type [Axis] Retirement Plan Type [Axis] Statement [Table] Statement [Table] Other Income, net Other Nonoperating Income (Expense) Actual Return on Plan Assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Adjustments to Reconcile Net Income to Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Unregulated Service Contracts Unregulated Service Contracts [Member] Non-Regulated Operation And Maintenance Contracts For Services On Water And Wastewater Systems Owned By Others Litigation Settlement Receivable Litigation Settlement Receivable The amount of litigation settlement receivable. Number of debt instruments Number Of Debt Instruments Number Of Debt Instruments All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Other Postretirement Benefits Plan Other Benefits Plan Other Benefits Plan Other Postretirement Benefits Plan [Member] Termination Date Trading Arrangement Termination Date Unbilled Revenues Increase (Decrease) in Contract with Customer, Asset Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Unamortized Debt Expense and Premiums on Long-Term Debt Unamortized Debt Expense And Premiums On Long-Term Debt, Policy [Policy Text Block] Disclosure of unamortized debt expense and premiums on long-term debt. Basic (in shares) Net Income (in shares) Weighted Average Number of Shares Outstanding, Basic State Taxes Paid-New Jersey NEW JERSEY Supplemental Cash Flows Information Cash Flow, Supplemental Disclosures [Text Block] Schedule of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Organization, Summary Of Significant Accounting Policies And Recent Developments [Table] Organization, Summary Of Significant Accounting Policies And Recent Developments [Table] Organization, Summary of Significant Accounting Policies and Recent Developments (Details) [Table] Other Income: Other Income (Expense), Net: Nonoperating Income (Expense) [Abstract] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] FMBs First Mortgage Bonds [Member] First Mortgage Bonds [Member] Other Regulated Revenues Regulated Operating Revenue, Other Accounts receivable write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Less: Unamortized Debt Expense Debt Instrument, Unamortized Discount Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common equity ratio Public Utilities, Approved Equity Capital Structure, Percentage 2030-2034 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Use of Estimates Use of Estimates, Policy [Policy Text Block] Current Liability Liability, Defined Benefit Plan, Current Insider Trading Arrangements [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Equity Securities Equity Securities [Member] Period for surcharge filings Surcharge Filing For Qualifying Recovery Costs, Period Surcharge Filing For Qualifying Recovery Costs, Period Current Portion of Long-term Debt Other Long-Term Debt, Current Utility Plant received as Construction Advances and Contributions Contribution of Property Shares Outstanding Common Stock, Value, Outstanding Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Employee Benefit Plans Employee Benefit Plans [Member] Employee Benefit Plans Expected cash contributions over next fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Operations and Maintenance Utilities Operating Expense, Maintenance and Operations At-The-Market Program Common Stock Issuance Stock Issued During Period, Value, New Issues Consolidation Items [Axis] Consolidation Items [Axis] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]