Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Long-term Debt: Long-Term Debt, Unclassified [Abstract] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Less Accumulated Depreciation Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Title of 12(b) Security Title of 12(b) Security Carrying Amount Reported Value Measurement [Member] Earnings Applicable to Common Stock, Diluted Earnings Applicable to Common Stock Net Income (Loss) Available to Common Stockholders, Diluted Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Customer [Axis] Customer [Axis] Number of entities approved for corporate reorganization Public Utilities, Approved Corporate Reorganization, Number Of Entities Public Utilities, Approved Corporate Reorganization, Number Of Entities Segment Reporting [Abstract] Segment Reporting [Abstract] Depreciation: Depreciation [Abstract] Common Stock, No Par Value, authorized 40,000, issued 18,577 and 18,521 in 2026 and 2025, respectively Common Stock, Value, Issued Payment of Grantee Withholding Taxes in Exchange for Restricted Stock Payment, Tax Withholding, Share-Based Payment Arrangement State corporate net income tax rates Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 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 Employee Benefit Plans Retirement Benefits [Text Block] Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Expected Return on Assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Restricted Stock Award - Net - Employees (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Employee Benefit Plans Employee Benefit Plans Employee Benefit Plans. LSLR Lead Service Line Replacement Plan [Member] Lead Service Line Replacement Plan Employee Benefit Plans Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Regulatory Liabilities Regulatory Liability, Noncurrent SUPPLEMENTAL DISCLOSURE OF CASH FLOWS INFORMATION: Income Tax Paid, after Refund Received [Abstract] Amendment Flag Amendment Flag CURRENT LIABILITIES: Liabilities, Current [Abstract] 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 Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Equity Portion of Allowance for Funds Used During Construction (AFUDC) Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Loss Contingencies [Table] Loss Contingencies [Table] June 2026 ACB (CoBank) Revolving Fund June 2026 ACB (CoBank) Revolving Fund [Member] June 2026 ACB (CoBank) Revolving Fund Weighted Average Interest Rates Short-Term Debt, Weighted Average Interest Rate, over Time Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Rates and Regulatory Matters Public Utilities Disclosure [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Total Capital Expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition Asset Acquisition [Axis] Asset Acquisition [Axis] OTHER LIABILITIES: Liabilities, Noncurrent [Abstract] Basic (in shares) Earnings Applicable to Common Stock, Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Retirement Benefits [Abstract] Nonredeemable Preferred Stock $7.00 Series Nonredeemable Preferred Stock, $7.00 Series [Member] Nonredeemable Preferred Stock, $7.00 Series Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] TOTAL CAPITALIZATION Capitalization, Long-Term Debt and Equity Regulatory Assets Regulatory Asset, Noncurrent Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of reportable segments Number of Reportable Segments TOTAL CURRENT LIABILITIES Liabilities, Current Approved recovery of costs Approved Recovery Of Costs, Amount Approved Recovery Of Costs, Amount Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Entity Address, City or Town Entity Address, City or Town Acquisition of assets Asset Acquisition, Consideration Transferred Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Southern Shores Southern Shores Water Company, LLC [Member] Southern Shores Water Company, LLC Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Class of Stock [Axis] Class of Stock [Axis] Payment of Preferred Dividends Payments of Ordinary Dividends, Preferred Stock and Preference Stock Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Earnings Applicable to Common Stock, Basic Net Income (Loss) Available to Common Stockholders, Basic Dividend Reinvestment & Common Stock Purchase Plan Stock Issued During Period, Value, Dividend Reinvestment Plan Other Income: Other Income: Nonoperating Income (Expense) [Abstract] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Aggregate lines of credit Maximum Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Current Portion of Long-term Debt Less: Current Portion of Long-term Debt Long-Term Debt, Current Maturities Utility Plant Expenditures, Including AFUDC of $516 in 2026 and $318 in 2025 Payment For Utility Plant Capital Expenditures Payment For Utility Plan Expenditures Restricted Stock Award - Board of Directors (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Recent Accounting Guidance New Accounting Pronouncements, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Schedule of Segment Transactions Segment Reporting [Table Text Block] $7.00 Series Preferred Dividend Convertible Preferred Dividends, Net of Tax Non-utility Assets - Net Non-Utility Assets, Net, Noncurrent Represents the amount of non-utility assets - net. Common Shares Outstanding: Assets, Average Outstanding [Abstract] Carrying amount of debt Long-Term Debt Short-Term Debt [Abstract] Short-Term Debt [Abstract] Dividend Reinvestment & Common Stock Purchase Plan (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan Pinelands Wastewater Company Pinelands Wastewater Company [Member] Pinelands Wastewater Company Document Period End Date Document Period End Date Changes in Assets and Liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] NET CASH USED IN INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock, outstanding (in shares) Cumulative preferred stock, nonredeemable shares outstanding (in shares) Preferred Stock, Shares Outstanding Borrowing amount Debt Instrument, Face Amount Unbilled Revenues Increase (Decrease) in Contract with Customer, Asset Basic: Earnings Per Share, Basic [Abstract] Capitalization Equity [Text Block] Security Exchange Name Security Exchange Name Consolidated Purchased Water Total Costs Cost of Purchased Water Water Production Public Utilities, Property, Plant and Equipment, Generation or Processing Supplemental Cash Flows Information Cash Flow, Supplemental Disclosures [Text Block] Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Commercial Commercial Customers [Member] Commercial Customers Company cash contributions to Pension Plan Payment for Pension Benefits Consolidated Other Operations and Maintenance Expenses Utilities Operating Expense, Maintenance And Operations, Other Utilities Operating Expense, Maintenance And Operations, Other Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings per share of Common Stock: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading Symbol Trading Symbol CoBank CoBank, ACB Committed Line Of Credit [Member] CoBank, ACB Committed Line Of Credit 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Accrued Taxes Accrued Income Taxes, Current Approved increase amount in revenues Public Utilities, Approved Rate Increase (Decrease), Amount Middlesex Water Company Investment Plan Middlesex Water Company Investment Plan [Member] Middlesex Water Company Investment Plan Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] NJBPU New Jersey Board Of Public Utilities [Member] New Jersey Board Of Public Utilities Purchase Commitment, Excluding Long-Term Commitment [Axis] Purchase Commitment, Excluding Long-Term Commitment [Axis] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Purchased Water: Utilities Operating Expense [Abstract] SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITY: Noncash Investing and Financing Items [Abstract] Diluted: Earnings Per Share, Diluted [Abstract] SUBTOTAL LONG-TERM DEBT Long-Term Debt, Gross Depreciation and Amortization Depreciation, Depletion and Amortization, Nonproduction Other Non-Regulated Revenues Unregulated Operating Revenue, Other Represent the amount of other non regulated revenues. CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Period for approved recovery of costs Approved Recovery Of Costs, Period Approved Recovery Of Costs, Period Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted (in shares) Adjusted Earnings Applicable to Common Stock, Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Cash dividends on Common Stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Shares Authorized Preferred Stock, Value Authorized Preferred stock value authorized. Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Line of Credit Facility [Table] Line of Credit Facility [Table] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Pinewood Acres Water Utility Assets Pinewood Acres Water Utility Assets [Member] Pinewood Acres Water Utility Assets Provision for Deferred Income Taxes and Investment Tax Credits Deferred Income Taxes and Tax Credits Regulated Regulated Segment [Member] Regulated [Member] Outstanding Short-Term Debt Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Other Assets and Liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Award Timing Predetermined Award Timing Predetermined [Flag] UTILITY PLANT - NET Public Utilities, Property, Plant and Equipment, Net Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Effective tax rate percentage Effective Income Tax Rate Reconciliation, Percent All Executive Categories All Executive Categories [Member] Regulated Operations [Abstract] Regulated Operations [Abstract] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] FMBs Long-Term Debt, Fair Value Schedule of Employee Retirement Benefit Plans Schedule of Net Benefit Costs [Table Text Block] Depreciation Depreciation Depreciation Plan Name [Domain] Plan Name [Domain] Asset Acquisition [Domain] Asset Acquisition [Domain] Operating Lease Right of Use Asset Operating Lease, Right-of-Use Asset Cumulative preferred stock, price (in dollars per share) Convertible preferred stock, conversion price (in dollars per share) Preferred Stock, Convertible, Conversion Price Operating Income: Operating Income (Loss) [Abstract] Cumulative Preferred Stock, No Par Value: Cumulative Preferred Stock No Par Value [Abstract] Cumulative Preferred Stock No Par Value Schedule of Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Approved increase percentage in rates Public Utilities, Approved Rate Increase (Decrease), Percentage Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Business Segment Data Segment Reporting [Text Block] Minimum Minimum Minimum [Member] Payment of Common Dividends Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date 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 Schedule of Operating Revenues Disaggregation of Revenue [Table Text Block] Notes Payable Notes Payable, Current, Excluding Current Maturities Notes Payable, Current, Excluding Current Maturities Company cash contributions to Other Benefits Plan Payment for Other Postretirement Benefits Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [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] May 2024 Delaware SRF May 2024 Delaware State Revolving Fund [Member] May 2024 Delaware State Revolving Fund TOTAL OTHER LIABILITIES Other Liabilities Unbilled Revenues Unbilled Receivables, Current General Public Utilities, Property, Plant and Equipment, Common Net Periodic Benefit Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Amortizing Secured Notes Secured Notes [Member] Amortizing Secured Notes Proceeds from Issuance of Common Stock Total net proceeds from shares issued and sold under agreement Proceeds from Issuance of Common Stock Common stock, authorized (in shares) Common Stock, Shares Authorized Number of shares issued and sold under agreement (in shares) Sale of Stock, Number of Shares Issued in Transaction Exercise Price Award Exercise Price Restricted Stock Award -Net-Employees Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report DSIC Distribution System Improvement Charge [Member] Distribution System Improvement Charge Foundational Filing 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] Segments [Domain] Segments [Domain] Wholesale Wholesale Customers [Member] Wholesale Customers Redemption of Long-term Debt Repayments of Long-Term Debt Convertible Preferred Stock $7.00 Series Convertible Preferred Stock [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Secured Debt Secured Debt [Member] Untreated Cost Of Treated Water Refers to cost of treated water during the period. Aggregate gross sales price Sale of Stock, Consideration Received on Transaction Adoption Date Trading Arrangement Adoption Date Average purchase of gallons Average Purchase Of Gallons The average purchase of gallons. DEPSC Delaware Public Service Commission [Member] Delaware Public Service Commission Cash Dividends on Common Stock Dividends, Common Stock, Cash Balance at beginning of period Balance at end of period Equity, Attributable to Parent Interest rate Debt Instrument, Interest Rate, Stated Percentage Total Other Income, net Other Income Nonoperating Income (Expense) Accrued Taxes Increase (Decrease) in Accrued Taxes Payable Accrued Payables for Utility Plant Accrued Payables For Utility Plant The amount of accrued payables for utility plant. ASSETS Assets [Abstract] Regulatory Agency [Axis] Regulatory Agency [Axis] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Nonredeemable Preferred Stock $4.75 Series Nonredeemable Preferred Stock, $4.75 Series [Member] Nonredeemable Preferred Stock, $4.75 Series Common Stock Issuance Expense Payments of Stock Issuance Costs Insider Trading Policies and Procedures [Line Items] Regulatory Agency [Domain] Regulatory Agency [Domain] Construction Advances and Contributions-Net Proceeds from (Payment for) Other Financing Activity Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Schedule of Lines of Credit Schedule of Line of Credit Facilities [Table Text Block] Regulatory Assets Regulatory Asset, Current Debt repaid Repayments of Debt Average Number of Average Number Of [Abstract] Average Number Of Commitments and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Central Index Key Entity Central Index Key Shares Outstanding Common Stock, Value, Outstanding All Adjustments to Compensation All Adjustments to Compensation [Member] Schedule of Carrying Amount and Fair Value of First Mortgage Bonds (FMBs) Schedule of Capitalization [Table Text Block] Equity [Abstract] 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] NET CASH PROVIDED BY OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Cash Dividends on Preferred Stock Dividends, Preferred Stock, Cash Operating Expenses: Operating Expenses [Abstract] Inter-segment Elimination Intersegment Eliminations [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] City Area Code City Area Code Other Taxes: Taxes, Miscellaneous [Abstract] All Individuals All Individuals [Member] Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Maximum percentage of costs to be recovered Requested Recovery Of Costs, Maximum, Percentage Requested Recovery Of Costs, Maximum, Percentage Statement [Line Items] Statement [Line Items] TOTAL ASSETS Consolidated Assets Assets Non – Regulated Non-Regulated Segment [Member] Non - Regulated [Member] Entity [Domain] Entity [Domain] Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Preferred stock, issued (in shares) Cumulative preferred stock, nonredeemable shares issued (in shares) Preferred Stock, Shares Issued Operating Segments Operating Segments [Member] Interest Charges Interest Expense, Nonoperating TOTAL COMMON EQUITY Partners' Capital State Revolving Trust Notes State Revolving Trust Notes [Member] State Revolving Trust Notes [Member] At-The-Market Program Common Stock Issuance (in shares) Number of common shares issued (in shares) Stock Issued During Period, Shares, New Issues PEO PEO [Member] Prepayments Increase (Decrease) in Prepaid Expense Refund credited amount Public Utilities, Approved Rate, Refund Credit Amount Public Utilities, Approved Rate, Refund Credit Amount Conversion of Preferred Stock into Common Stock Preferred Stock Conversions, Inducements Measurement Basis [Axis] Measurement Basis [Axis] Other Other Liabilities, Noncurrent Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Other Operations and Maintenance Expenses: Utilities Operating Expense, Maintenance and Operations [Abstract] Retained Earnings Retained Earnings [Member] Lease Obligations Operating Lease, Liability, Noncurrent Total Operating Expenses Operating Expenses Allowance for Funds Used During Construction Public Utilities, Allowance for Funds Used During Construction, Additions Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock outstanding (in shares) Balance at beginning of period (in shares) Balance at end of period (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Deferred Debt Issuance Expense Payments of Debt Issuance Costs Diluted (in dollars per share) Diluted EPS (in dollars per share) Earnings Per Share, Diluted Tidewater Tidewater Utilities, Inc. [Member] Tidewater Utilities, Inc. Rate and Regulatory Matters (Details) [Table] Rate and Regulatory Matters (Details) [Table] Rate and Regulatory Matters (Details) [Table] Entity Current Reporting Status Entity Current Reporting Status NET CASH PROVIDED BY FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Litigation Case [Domain] Litigation Case [Domain] Shares Outstanding Preferred Stock, Value, Outstanding Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Construction Advances Construction Advances [Member] Construction Advances Operations and Maintenance Utilities Operating Expense, Maintenance and Operations Adjustments to Reconcile Net Income to Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] $7.00 Series Preferred Dividend (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Total Revenue from Contracts with Customers Revenue from Contract with Customer, Excluding Assessed Tax CASH FLOWS FROM FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Available Line of Credit Facility, Remaining Borrowing Capacity Construction Agreement Construction Agreement [Member] Construction Agreement Other Regulated Revenues Regulated Operating Revenue, Other Interest Cost Defined Benefit Plan, Interest Cost RESIC Resiliency And Environmental System Improvement Charge [Member] Resiliency And Environmental System Improvement Charge Foundational Filing Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Schedule of Recently Issued Accounting Standards Accounting Standards Update and Change in Accounting Principle [Table Text Block] Fair Value Estimate of Fair Value Measurement [Member] Revenue Recognition from Contracts with Customers Revenue from Contract with Customer [Text Block] At-The-Market Program Common Stock Issuance At-the-market program common stock issuance Stock Issued During Period, Value, New Issues Prepayments Prepaid Expense, Current Expected cash contributions over remainder of the current year Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Segment Reporting [Table] Segment Reporting [Table] Income Taxes: Income Tax Expense (Benefit), Continuing Operations [Abstract] Sale of Stock [Axis] Sale of Stock [Axis] 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 Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating Income Operating Income Operating Income (Loss) Cash Paid During the Six Months for: Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract] Current Fiscal Year End Date Current Fiscal Year End Date Advances for Construction Construction Payable 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 NJBPU Treated Water Agreement New Jersey Board Of Public Utilities Treated Water Agreement [Member] New Jersey Board Of Public Utilities Treated Water Agreement Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Middlesex Middlesex [Member] Middlesex 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] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service Cost Defined Benefit Plan, Service Cost Net Short-term Bank Borrowings Proceeds from (Repayments of) Short-Term Debt Other Taxes Consolidated Other Taxes Taxes, Other Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] ATM Equity Sales Agreement At-The-Market Equity Offering [Member] At-The-Market Equity Offering Materials & Supplies Increase (Decrease) in Raw Materials, Packaging Materials and Supplies Inventories Equity Components [Axis] Equity Components [Axis] Accounts Receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Number of customers served Asset Acquisition, Number Of Customers Served Number Of Customers Serviced Income Taxes Income Tax Paid, after Refund Received Class of Stock [Line Items] Class of Stock [Line Items] CONTRIBUTIONS IN AID OF CONSTRUCTION Contributions in Aid of Construction Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] CAPITALIZATION: Capitalization, Long-Term Debt and Equity [Abstract] Entity Interactive Data Current Entity Interactive Data Current December 2025 Delaware State Revolving Fund December 2025 Delaware State Revolving Fund [Member] December 2025 Delaware State Revolving Fund Accumulated Deferred Income Taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Average purchase of gallons a day under agreement (in mgd) Purchase Obligation, Volume Per Day The average purchase of gallons. Entity Small Business Entity Small Business TOTAL Public Utilities, Property, Plant and Equipment, Plant in Service Less: Unamortized Debt Expense Debt Instrument, Unamortized Discount Termination Date Trading Arrangement Termination Date Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Statutory federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other Other Liabilities, Current Other Other Assets, Noncurrent Document Type Document Type Accrued Interest Accrued Liabilities, Current Purchase Commitment, Excluding Long-Term Commitment [Domain] Purchase Commitment, Excluding Long-Term Commitment [Domain] Schedule of Purchased Water Costs Purchase Commitment, Excluding Long-Term Commitment [Table Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Proceeds from Issuance of Long-term Debt Debt drawn down Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Other Benefits Other Postretirement Benefits Plan [Member] Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Registrant Name Entity Registrant Name Common equity ratio Public Utilities, Approved Equity Capital Structure, Percentage Income before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] COMMITMENTS AND CONTINGENT LIABILITIES (Note 7) Commitments and Contingencies Operating Revenues Total Revenue Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] CAPITALIZATION AND LIABILITIES Liabilities and Equity [Abstract] Rate and Regulatory Matters (Details) [Line Items] Rate and Regulatory Matters (Details) [Line Items] Rate and Regulatory Matters (Details) [Line Items] All Award Types Award Type [Domain] Bank of America Bank Of America Uncommitted Line Of Credit [Member] Bank of America [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Acquisition of Water Systems Payments to Acquire Water Systems Regulated Tariff Sales Regulated Tariff-Based Services [Member] Regulated Tariff-Based Water And Wastewater Utility Services PEO Name PEO Name Accrued Interest Increase (Decrease) in Accrued Liabilities Utility Plant received as Construction Advances and Contributions Contribution of Property Short-Term Debt [Table] Short-Term Debt [Table] TOTAL OTHER ASSETS Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [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 Preferred Stock Dividend Requirements Preferred Dividend Preferred Stock Dividends, Income Statement Impact Accounts Payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Maximum value of costs to be recovered Requested Recovery Of Costs, Maximum, Amount Requested Recovery Of Costs, Maximum, Amount Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] June 2026 Delaware State Revolving Fund June 2026 Delaware State Revolving Fund [Member] June 2026 Delaware State Revolving Fund Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Debt Instrument [Axis] Debt Instrument [Axis] Stock Compensation Expense Share-Based Payment Arrangement, Noncash Expense AFUDC-Debt utility plant expenditures Interest Capitalized Interest Paid, Capitalized, Investing Activity Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Adjusted Earnings Applicable to Common Stock, Diluted Net Income (Loss) Available to Common Stockholders, Diluted, Adjusted Represents the amount of adjusted earnings applicable to common stock. Conversion of $7 Preferred Stock to Common Stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities PNC Bank PNC Bank Committed Line Of Credit [Member] PNC Bank [Member] Customer [Domain] Customer [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Basic EPS (in dollars per share) Earnings Per Share, Basic Increase (decrease) in income taxes Increase (Decrease) In Income Tax Expense (Benefit) Increase (Decrease) In Income Tax Expense (Benefit) September 2024 Delaware SRF September 2024 Delaware State Revolving Fund [Member] Delaware State Revolving Fund Unearned Revenues and Advanced Service Fees Contract with Customer, Liability, Current Middlesex and Pinelands Middlesex Water Company, Pinelands Water Company And Pinelands Wastewater Company [Member] Middlesex Water Company, Pinelands Water Company And Pinelands Wastewater Company TOTAL CURRENT ASSETS Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Pinelands Water Company Pinelands Water Company [Member] Pinelands Water Company Long-term Debt TOTAL LONG-TERM DEBT Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Fire Protection Fire Protection Customers [Member] Fire-Protection Customers Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Industrial Industrial Customers [Member] Industrial Customers Accounts Receivable, net of allowance for uncollectible accounts of $3,074 and $1,625, respectively Accounts Receivable, after Allowance for Credit Loss, Current Retained Earnings Retained Earnings (Accumulated Deficit) Schedule of Weighted Average Daily Amounts of Borrowings Outstanding and Weighted Average Interest Rates Schedule of Short-Term Debt [Table Text Block] Product and Service [Axis] Product and Service [Axis] Restricted Cash Restricted Cash, Noncurrent 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] NJWSA Untreated Water Agreement New Jersey Water Supply Authority Untreated Water Agreement [Member] New Jersey Water Supply Authority Agreement Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Pension Benefits Pension Plan [Member] Short-Term Debt [Line Items] Short-Term Debt [Line Items] Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Common Stock, No Par Value Common Stock No Par Value [Abstract] Common Stock No Par Value Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Residential Residential Customers [Member] Residential Customers Treated Water Treated Water [Member] Treated Water Weighted average interest rate Short-Term Debt, Weighted Average Interest Rate, at Point in Time Loans Payable Loans Payable [Member] UTILITY PLANT: Public Utilities, Property, Plant and Equipment, Net [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] MDL Lawsuit Multi-District Litigation Lawsuit [Member] Multi-District Litigation Lawsuit TOTAL CAPITALIZATION AND LIABILITIES Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Construction Work in Progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] Other Income, net Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Average Daily Amounts Outstanding Line of Credit Facility, Average Outstanding 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] OTHER ASSETS: Assets, Noncurrent [Abstract] Conversion of $7 Preferred Stock to Common Stock Stock Issued During Period, Value, Conversion of Convertible Securities Preferred stock, authorized (in shares) Cumulative preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Materials and Supplies (at average cost) Inventory, Raw Materials and Supplies, Gross Non-Regulated Contract Operations Unregulated Service Contracts [Member] Non-Regulated Operation And Maintenance Contracts For Services On Water And Wastewater Systems Owned By Others Capital Expenditures: Segment Reporting, Other Disclosure [Abstract] Preferred Stock, No Par Value; authorized 120; issued 13 TOTAL PREFERRED STOCK Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Number of debt instruments Number Of Debt Instruments Number Of Debt Instruments Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Common Stock Issuance Expense Stock Issued During Period, Issuance Costs Stock Issued During Period, Issuance Costs Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts Payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Tidewater Customers Tidewater Utilities, Inc. Customers [Member] Tidewater Utilities, Inc. Customers Treated Cost Of Untreated Water Refers to cost of untreated water during the period. Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Supplemental Cash Flow Elements [Abstract] Name Trading Arrangement, Individual Name First Mortgage Bonds FMBs First Mortgage Bonds [Member] First Mortgage Bonds [Member] Cash and Cash Equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Short-term Borrowings Short-Term Debt [Text Block] Stock, Class of Stock [Table] Stock, Class of Stock [Table] Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] Cash Surrender Value of Life Insurance Life Insurance, Corporate or Bank Owned, Change in Value CURRENT ASSETS: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Amortizing Secured Notes And State Revolving Trust Notes Secured Notes And State Revolving Trust Notes [Member] Amortizing Secured Notes And State Revolving Trust Notes Transmission and Distribution Public Utilities, Property, Plant and Equipment, Transmission and Distribution Income Taxes Consolidated Income Taxes Income Tax Expense (Benefit) Estimated future expenditure obligation Purchase Obligation Award Timing Method Award Timing Method [Text Block] Period for surcharge filings Surcharge Filing For Qualifying Recovery Costs, Period Surcharge Filing For Qualifying Recovery Costs, Period Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net Income: Net Income (Loss) Attributable to Parent [Abstract] Amortization of Unrecognized Losses (Gains) Defined Benefit Plan, Amortization of Gain (Loss) Settlement payments received Proceeds from Legal Settlements Net Income Net Income Consolidated Net Income Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Return on equity Public Utilities, Approved Return on Equity, Percentage Restatement Determination Date: Restatement Determination Date [Axis] Regulatory Liabilities Regulatory Liability, Current Add: Premium on Issuance of Long-term Debt Debt Instrument, Unamortized Premium Restricted Stock Award - Board of Directors Stock Issued During Period, Value, Restricted Stock Award, Gross Employee Benefit Plans - Schedule of Employee Retirement Benefit Plans (Details) [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Shares Authorized Common Stock, Value Authorized Common stock value authorized. Operating Revenues: Revenues [Abstract] Basis of Presentation and Recent Developments Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]