Purchased Water: Utilities Operating Expense [Abstract] Cash dividends on Common Stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Materials & Supplies Increase (Decrease) in Raw Materials, Packaging Materials and Supplies Inventories Statistical Measurement [Domain] Statistical Measurement [Domain] TOTAL CAPITALIZATION Capitalization, Long-Term Debt and Equity Schedule of Weighted Average Daily Amounts of Borrowings Outstanding and Weighted Average Interest Rates Schedule of Short-Term Debt [Table Text Block] Expected Return on Assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets 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] 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 Recent Accounting Guidance New Accounting Pronouncements, Policy [Policy Text Block] Company cash contributions to Pension Plan Payment for Pension Benefits Accounts Payable Increase (Decrease) in Accounts Payable Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Employee Benefit Plans Employee Benefit Plans Employee Benefit Plans. Basic (in dollars per share) Basic EPS (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] LSLR Lead Service Line Replacement Plan [Member] Lead Service Line Replacement Plan Schedule of Lines of Credit Schedule of Line of Credit Facilities [Table Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Revenue Recognition from Contracts with Customers Revenue from Contract with Customer [Text Block] Rates and Regulatory Matters Public Utilities Disclosure [Text Block] Payment of Preferred Dividends Payments of Ordinary Dividends, Preferred Stock and Preference Stock 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 Stock, Class of Stock [Table] Stock, Class of Stock [Table] Unbilled Revenues Unbilled Receivables, Current Schedule of Segment Transactions Schedule of Segment Reporting Information, by Segment [Table Text Block] Outstanding Short-Term Debt 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 Benefits Pension Plan [Member] Weighted Average Interest Rates Short-Term Debt, Weighted Average Interest Rate, over Time Stock Compensation Expense Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Cash Dividends on Common Stock Dividends, Common Stock, Cash Balance at beginning of period Balance at end of period Equity, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Common stock, authorized (in shares) Common Stock, Shares Authorized At-The-Market Program Common Stock Issuance (in shares) Number of common shares issued (in shares) Stock Issued During Period, Shares, New Issues CURRENT ASSETS: Assets, Current [Abstract] Nonredeemable Preferred Stock $7.00 Series Nonredeemable Preferred Stock, $7.00 Series [Member] Nonredeemable Preferred Stock, $7.00 Series TOTAL CAPITALIZATION AND LIABILITIES Liabilities and Equity CAPITALIZATION AND LIABILITIES Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum Maximum [Member] Long-term Debt: Long-Term Debt, Unclassified [Abstract] Total 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] 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] Pay vs Performance Disclosure [Line Items] Southern Shores Southern Shores Water Company, LLC [Member] Southern Shores Water Company, LLC 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] Depreciation and Amortization Depreciation, Depletion and Amortization, Nonproduction Income before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Other Other Liabilities, Noncurrent Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Utility Plant Expenditures, Including AFUDC of $249 in 2026 and $154 in 2025 Payment For Utility Plant Capital Expenditures Payment For Utility Plan 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 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] 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 Non-utility Assets - Net Non-Utility Assets, Net, Noncurrent Represents the amount of non-utility assets - net. Transmission and Distribution Public Utilities, Property, Plant and Equipment, Transmission and Distribution Document Fiscal Period Focus Document Fiscal Period Focus 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] Accrued Taxes Increase (Decrease) in Accrued Taxes Payable Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Pinelands Wastewater Company Pinelands Wastewater Company [Member] Pinelands Wastewater Company Award Type Award Type [Axis] Carrying amount of debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] TOTAL ASSETS Consolidated Assets Assets Trading Symbol Trading Symbol TOTAL COMMON EQUITY Partners' Capital Entity Address, City or Town Entity Address, City or Town Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] 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 Consolidated Other Operations and Maintenance Expenses Utilities Operating Expense, Maintenance And Operations, Other Utilities Operating Expense, Maintenance And Operations, Other 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 Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Employee Benefit Plans Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits 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] 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 Common stock outstanding (in shares) Balance at beginning of period (in shares) Balance at end of period (in shares) Common Stock, Shares, Outstanding Middlesex Water Company Investment Plan Middlesex Water Company Investment Plan [Member] Middlesex Water Company Investment Plan NJBPU New Jersey Board Of Public Utilities [Member] New Jersey Board Of Public Utilities Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Schedule of Operating Revenues Disaggregation of Revenue [Table Text Block] Accrued Taxes Accrued Income Taxes, Current Changes in Assets and Liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [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] Other Non-Regulated Revenues Unregulated Operating Revenue, Other Represent the amount of other non regulated revenues. Interest Charges: Interest Expense, Nonoperating [Abstract] Retained Earnings Retained Earnings [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 $7.00 Series Preferred Dividend (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock 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] Income Taxes Consolidated Income Taxes Income Tax Expense (Benefit) Shares Authorized Preferred Stock, Value Authorized Preferred stock value authorized. Sale of Stock [Domain] Sale of Stock [Domain] TOTAL OTHER ASSETS Other Assets Pinewood Acres Water Utility Assets Pinewood Acres Water Utility Assets [Member] Pinewood Acres Water Utility 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] Regulated Regulated Segment [Member] Regulated [Member] Product and Service [Domain] Product and Service [Domain] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Equity Portion of Allowance for Funds Used During Construction (AFUDC) Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Employee Benefit Plans - Schedule of Employee Retirement Benefit Plans (Details) [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] 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 Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] 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] 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] Amortization of Unrecognized Losses (Gains) 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 Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Approved increase percentage in rates Public Utilities, Approved Rate Increase (Decrease), Percentage PEO Total Compensation Amount PEO Total Compensation Amount Purchase Commitment, Excluding Long-Term Commitment [Axis] Purchase Commitment, Excluding Long-Term Commitment [Axis] Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation Consolidated Depreciation Depreciation 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] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segment Number of Reportable Segments Construction Work in Progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Other Performance Measure, Amount Other Performance Measure, Amount Regulatory Liabilities Regulatory Liability, Noncurrent Entity Address, State or Province Entity Address, State or Province May 2024 Delaware SRF May 2024 Delaware State Revolving Fund [Member] May 2024 Delaware State Revolving Fund TOTAL CURRENT LIABILITIES Liabilities, Current 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] Amortizing Secured Notes Secured Notes [Member] Amortizing Secured Notes Individual: Individual [Axis] Return on equity Public Utilities, Approved Return on Equity, Percentage Payment of Common Dividends Payments of Ordinary Dividends, Common Stock 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 Document Fiscal Year Focus Document Fiscal Year Focus Operating Lease Right of Use Asset Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Redemption of Long-term Debt Repayments of Long-Term Debt Effective tax rate percentage Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Wholesale Wholesale Customers [Member] Wholesale Customers Carrying Amount Reported Value Measurement [Member] Plan Name [Domain] Plan Name [Domain] Equity [Abstract] Untreated Cost Of Treated Water Refers to cost of treated water during the period. Estimated future expenditure obligation Purchase Obligation Business Segment Data Segment Reporting Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Average purchase of gallons Average Purchase Of Gallons The average purchase of gallons. DEPSC Delaware Public Service Commission [Member] Delaware Public Service Commission Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Approved increase amount in 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 Employee Retirement Benefit Plans Schedule of Net Benefit Costs [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Nonredeemable Preferred Stock $4.75 Series Nonredeemable Preferred Stock, $4.75 Series [Member] Nonredeemable Preferred Stock, $4.75 Series Other Other Assets, Noncurrent Customer [Domain] Customer [Domain] Central Index Key Entity Central Index Key PEO Name PEO Name Operating Revenues Total Revenue Revenues Aggregate gross sales price Sale of Stock, Consideration Received on Transaction 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] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Average Number of Average Number Of [Abstract] Average Number Of Arrangement Duration Trading Arrangement Duration 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 Materials and Supplies (at average cost) Inventory, Raw Materials and Supplies, Gross General Public Utilities, Property, Plant and Equipment, Common Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Local Phone Number Local Phone Number CAPITALIZATION: Capitalization, Long-Term Debt and Equity [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Statutory federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Consolidated Purchased Water Total Costs Cost of Purchased Water ASSETS Assets [Abstract] Long-term Debt TOTAL LONG-TERM DEBT Long-Term Debt, Excluding Current Maturities Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Employee Benefit Plans Retirement Benefits [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] Entity Address, Address Line One Entity Address, Address Line One Allowance for Funds Used During Construction Public Utilities, Allowance for Funds Used During Construction, Additions Interest rate Debt Instrument, Interest Rate, Stated Percentage Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Lease Obligations Operating Lease, Liability, Noncurrent Conversion of $7 Preferred Stock to Common Stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Maximum percentage of costs to be recovered Requested Recovery Of Costs, Maximum, Percentage Requested Recovery Of Costs, Maximum, Percentage Fair Value as of Grant Date Award Grant Date Fair Value Registrant Name Entity Registrant Name Non – Regulated Non-Regulated Segment [Member] Non - Regulated [Member] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net Periodic Benefit Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other Taxes Consolidated Other Taxes Taxes, Other Depreciation: Depreciation [Abstract] Regulated Operations [Abstract] Regulated Operations [Abstract] Document Quarterly Report Document Quarterly Report State Revolving Trust Notes State Revolving Trust Notes [Member] State Revolving Trust Notes [Member] 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] 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] Interest Cost Defined Benefit Plan, Interest Cost Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Restatement Determination Date: Restatement Determination Date [Axis] Other Operations and Maintenance Expenses: Utilities Operating Expense, Maintenance and Operations [Abstract] Non-PEO NEO Non-PEO NEO [Member] Income Taxes: Income Tax Expense (Benefit), Continuing Operations [Abstract] Construction Advances and Contributions-Net Proceeds from (Payment for) Other Financing Activity Sale of Stock [Axis] Sale of Stock [Axis] 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] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Short-Term Debt [Table] Short-Term Debt [Table] 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] Compensation Amount Outstanding Recovery Compensation Amount Borrowing amount Debt Instrument, Face Amount Construction Advances Construction Advances [Member] Construction Advances Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Retirement Plan Type [Domain] Retirement Plan Type [Domain] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] 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 Operating Revenues: Revenues [Abstract] 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 Cash Paid During the 3 Months for: Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract] Litigation Case [Axis] Litigation Case [Axis] Segments [Domain] Segments [Domain] Available Line of Credit Facility, Remaining Borrowing Capacity Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Schedule of Recently Issued Accounting Standards Accounting Standards Update and Change in Accounting Principle [Table Text Block] Minimum Minimum Minimum [Member] 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 OTHER ASSETS: Assets, Noncurrent [Abstract] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Operating Income: Operating Income (Loss) [Abstract] Preferred Stock, No Par Value; authorized 120; issued 13 aoutstanding TOTAL PREFERRED STOCK Preferred Stock, Value, Issued 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 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 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 All Executive Categories All Executive Categories [Member] Common Stock, No Par Value, authorized 40,000, issued 18,577 and 18,521 in 2026 and 2025, respectively Common Stock, Value, Issued Commitments and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Diluted (in shares) Adjusted Earnings Applicable to Common Stock, Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average interest rate Short-Term Debt, Weighted Average Interest Rate, at Point in Time COMMITMENTS AND CONTINGENT LIABILITIES (Note 7) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Loans Payable Loans Payable [Member] Entity Small Business Entity Small Business ATM Equity Sales Agreement At-The-Market Equity Offering [Member] At-The-Market Equity Offering 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 Preferred stock, outstanding (in shares) Cumulative preferred stock, nonredeemable shares outstanding (in shares) Preferred Stock, Shares Outstanding 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 Short-Term Debt [Line Items] Short-Term Debt [Line Items] Equity Component [Domain] Equity Component [Domain] Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] December 2025 Delaware State Revolving Fund December 2025 Delaware State Revolving Fund [Member] December 2025 Delaware State Revolving Fund Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount 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] Diluted: Earnings Per Share, Diluted [Abstract] Add: Premium on Issuance of Long-term Debt Debt Instrument, Unamortized Premium Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Document Type Document Type Earnings Per Share Earnings Per Share [Text Block] 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] Proceeds from Issuance of Common Stock Proceeds from Issuance of Common Stock Total Revenue from Contracts with Customers Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Less Accumulated Depreciation Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Acquisition of assets Asset Acquisition, Consideration Transferred Name Forgone Recovery, Individual Name TOTAL CURRENT ASSETS Assets, Current Regulatory Agency [Domain] Regulatory Agency [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] 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] $7.00 Series Preferred 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 Conversion of Preferred Stock Into Common Stock Preferred Stock Conversions, Inducements Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Earnings Applicable to Common Stock, Basic Net Income (Loss) Available to Common Stockholders, Basic Regulatory Assets Regulatory Asset, Current Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] CURRENT LIABILITIES: Liabilities, Current [Abstract] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Rate and Regulatory Matters (Details) [Line Items] Rate and Regulatory Matters (Details) [Line Items] Rate and Regulatory Matters (Details) [Line Items] 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 Total Operating Expenses Operating Expenses Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Regulated Tariff Sales 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 Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts Receivable, net of allowance for uncollectible accounts of $1,873 and $1,625, respectively Accounts Receivable, after Allowance for Credit Loss, Current Title of 12(b) Security Title of 12(b) Security SUPPLEMENTAL DISCLOSURE OF CASH FLOWS INFORMATION: Income Taxes Paid, Net [Abstract] Expected cash contributions over remainder of the current year Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 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 Earnings per share of Common Stock: Earnings Per Share [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Total Other Income, net Consolidated Other Income, Net Nonoperating Income (Expense) Prepayments Increase (Decrease) in Prepaid Expense Maximum value of costs to be recovered Requested Recovery Of Costs, Maximum, Amount Requested Recovery Of Costs, Maximum, Amount Unearned Revenue & Advanced Service Fees Increase (Decrease) in Contract with Customer, Liability Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] UTILITY PLANT: Public Utilities, Property, Plant and Equipment, Net [Abstract] 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. PNC Bank PNC Bank Committed Line Of Credit [Member] PNC Bank [Member] 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 Middlesex and Pinelands Middlesex Water Company, Pinelands Water Company And Pinelands Wastewater Company [Member] Middlesex Water Company, Pinelands Water Company And Pinelands Wastewater Company Award Timing Disclosures [Line Items] Service Cost Defined Benefit Plan, Service Cost Pinelands Water Company Pinelands Water Company [Member] Pinelands Water Company SUBTOTAL LONG-TERM DEBT Long-Term Debt, Gross Fire Protection Fire Protection Customers [Member] Fire-Protection Customers Industrial Industrial Customers [Member] Industrial Customers Capitalization Equity [Text Block] Schedule of Carrying Amount and Fair Value of First Mortgage Bonds (FMBs) Schedule of Capitalization [Table Text Block] Net Income Net Income Consolidated Net Income Net Income (Loss) Attributable to Parent Inter-segment Elimination Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date OTHER LIABILITIES: Liabilities, Noncurrent [Abstract] UTILITY PLANT - NET Public Utilities, Property, Plant and Equipment, Net NJWSA Untreated Water Agreement New Jersey Water Supply Authority Untreated Water Agreement [Member] New Jersey Water Supply Authority Agreement 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] 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 Net Income: Net Income (Loss) Attributable to Parent [Abstract] Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts Receivable Increase (Decrease) in Accounts Receivable Residential Residential Customers [Member] Residential Customers Treated Water Treated Water [Member] Treated Water Entity Current Reporting Status Entity Current Reporting Status Customer [Axis] Customer [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] MDL Lawsuit Multi-District Litigation Lawsuit [Member] Multi-District Litigation Lawsuit Operating Income Consolidated Operating Income Operating Income (Loss) Line of Credit Line of Credit [Member] Retained Earnings Retained Earnings (Accumulated Deficit) Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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] Executive Category: Executive Category [Axis] Debt repaid Repayments of Debt State corporate net income tax rates Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Average Daily Amounts Outstanding Line of Credit Facility, Average Outstanding Amount Cash Surrender Value of Life Insurance Life Insurance, Corporate or Bank Owned, Change in Value Class of Stock [Axis] Class of Stock [Axis] Proceeds from Issuance of Long-term Debt Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date 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] Company cash contributions to Other Benefits Plan Payment for Other Postretirement Benefits Retirement Plan Type [Axis] Retirement Plan Type [Axis] Convertible Preferred Stock $7.00 Series Convertible Preferred Stock [Member] Statement [Table] Statement [Table] Other Income, net Other Nonoperating Income (Expense) 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] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Non-Regulated Contract Operations Unregulated Service Contracts [Member] Non-Regulated Operation And Maintenance Contracts For Services On Water And Wastewater Systems Owned By Others Number of debt instruments Number Of Debt Instruments Number Of Debt Instruments All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Amendment Flag Amendment Flag Other Benefits Other Postretirement Benefits Plan [Member] Common Stock Issuance Expense Stock Issued During Period, Issuance Costs Stock Issued During Period, Issuance Costs Termination Date Trading Arrangement Termination Date NET CASH PROVIDED BY FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Unbilled Revenues Increase (Decrease) in Contract with Customer, Asset Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Tidewater Customers Tidewater Utilities, Inc. Customers [Member] Tidewater Utilities, Inc. Customers Basis of Presentation and Recent Developments Basis of Presentation and Significant Accounting Policies [Text Block] Treated 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 Basic (in shares) Earnings Applicable to Common Stock, Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Supplemental Cash Flows Information Cash Flow, Supplemental Disclosures [Text Block] Schedule of Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Other Income: Other Income: Nonoperating Income (Expense) [Abstract] Entity Tax Identification Number Entity Tax Identification Number First Mortgage Bonds FMBs First Mortgage Bonds [Member] First Mortgage Bonds [Member] Asset Acquisition [Axis] Asset Acquisition [Axis] Other Regulated Revenues Regulated Operating Revenue, Other Capital Expenditures: Segment Reporting Information, Additional Information [Abstract] 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 Common stock, issued (in shares) Common Stock, Shares, Issued Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Settlement payments received Proceeds from Legal Settlements Interest Charges Consolidated Interest Charges Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Amortizing Secured Notes And State Revolving Trust Notes Secured Notes And State Revolving Trust Notes [Member] Amortizing Secured Notes And State Revolving Trust Notes Loss Contingencies [Line Items] Loss Contingencies [Line Items] Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Regulatory Liabilities Regulatory Liability, Current 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 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 Shares Outstanding Common Stock, Value, Outstanding CONTRIBUTIONS IN AID OF CONSTRUCTION Contributions in Aid of Construction Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Prepayments Prepaid Expense, Current Operating Expenses: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other Other Liabilities, Current Operations and Maintenance Utilities Operating Expense, Maintenance and Operations At-The-Market Program Common Stock Issuance Stock Issued During Period, Value, New Issues Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] 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] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Notes Payable Notes Payable, Current