Cover [Abstract] Document Type Entity Central Index Key Document Period End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Document Quarterly Report Document Transition Report Entity File Number Entity Registrant Name Entity Incorporation State Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Name of Exchange on which Security is Registered Entity Reporting Status Current Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Income Statement [Abstract] Operating Revenues Revenues Total Revenue Operating Expenses: Operations and Maintenance Costs incurred and are directly related to operations and maintenance. Depreciation Other Taxes Total Operating Expenses Operating Expenses Gain on Sale of Subsidiary Operating Income Operating Income Other Income: Allowance for Funds Used During Construction Other Income, net Total Other Income, net Nonoperating Income (Expense) Interest Charges Income before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income Taxes Net Income Net Income Preferred Stock Dividend Requirements Preferred Dividend Earnings Applicable to Common Stock Earnings Applicable to Common Stock Earnings per share of Common Stock: Earnings Per Share [Abstract] Basic Basic EPS Diluted Diluted EPS Average Number of Common Shares Outstanding: Basic Weighted average number of basic shares outstanding Diluted Weighted average number of diluted shares outstanding Statement of Financial Position [Abstract] ASSETS UTILITY PLANT: Water Production Transmission and Distribution General Construction Work in Progress TOTAL Public Utilities, Property, Plant and Equipment, Plant in Service Less Accumulated Depreciation UTILITY PLANT - NET Public Utilities, Property, Plant and Equipment, Net CURRENT ASSETS: Cash and Cash Equivalents Accounts Receivable, net of allowance for uncollectible accounts of $2,530 and $2,574, respectively Unbilled Revenues Materials and Supplies (at average cost) Prepayments TOTAL CURRENT ASSETS Assets, Current OTHER ASSETS: Operating Lease Right of Use Asset Preliminary Survey and Investigation Charges The amount of preliminary survey and investigation charges that are deferred as of the balance sheet date. Regulatory Assets Non-utility Assets - Net Refers to amount of non utility fixed assets as of the balance sheet date. Other TOTAL OTHER ASSETS This element represents aggregate carrying amount, at the balance sheet date, of noncurrent deferred charges held by public utility entities and other noncurrent assets not separately disclosed in the balance sheet. Deferred Charges And Other Assets TOTAL ASSETS Assets CAPITALIZATION AND LIABILITIES CAPITALIZATION: Capitalization, Long-Term Debt and Equity [Abstract] Common Stock, No Par Value Retained Earnings TOTAL COMMON EQUITY TOTAL COMMON EQUITY Balance Balance Refers to total equity attributable to common stockholders. Preferred Stock TOTAL PREFERRED STOCK Long-term Debt TOTAL LONG-TERM DEBT TOTAL CAPITALIZATION Capitalization, Long-Term Debt and Equity CURRENT LIABILITIES: Current Portion of Long-term Debt Notes Payable Accounts Payable Accrued Taxes Accrued Interest Unearned Revenues and Advanced Service Fees Other Other Liabilities, Current TOTAL CURRENT LIABILITIES Liabilities, Current COMMITMENTS AND CONTINGENT LIABILITIES (Note 7) OTHER LIABILITIES: Customer Advances for Construction Advances from customers for construction. Lease Obligations - Operating Non-Current Lease Liability Accumulated Deferred Income Taxes Amount of accumulated deferred income taxes. Employee Benefit Plans Regulatory Liabilities Other Other Liabilities, Noncurrent TOTAL OTHER LIABILITIES Liabilities, Other than Long-Term Debt, Noncurrent CONTRIBUTIONS IN AID OF CONSTRUCTION TOTAL CAPITALIZATION AND LIABILITIES Liabilities and Equity Condensed Consolidated Balance Sheets Unaudited Allowance for uncollectible accounts Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Depreciation and Amortization Provision for Deferred Income Taxes and Investment Tax Credits Equity Portion of Allowance for Funds Used During Construction (AFUDC) Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Cash Surrender Value of Life Insurance Life Insurance, Corporate or Bank Owned, Change in Value Stock Compensation Expense Gain on Sale of Subsidairy Gain on Sale of Investments Changes in Assets and Liabilities: Accounts Receivable Increase (Decrease) in Accounts Receivable Unbilled Revenues Increase (decrease) in unbilled revenues for the period. Treated [Default Label] Materials and Supplies Increase (Decrease) in Raw Materials, Packaging Materials and Supplies Inventories Prepayments Increase (Decrease) in Prepaid Expense Accounts Payable Increase (Decrease) in Accounts Payable Accrued Taxes Increase (Decrease) in Accrued Taxes Payable Accrued Interest Increase (Decrease) in Interest Payable, Net Employee Benefit Plans Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Unearned Revenue and Advanced Service Fees Other Assets and Liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net NET CASH PROVIDED BY OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Utility Plant Expenditures, Including AFUDC of $175 in 2022, $531 in 2021 Capital Expenditures Proceeds from Sale of Subsidairy NET CASH USED IN INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Redemption of Long-term Debt Repayments of Long-Term Debt Proceeds from Issuance of Long-term Debt Net Short-term Bank Borrowings Deferred Debt Issuance Expense Payments of Debt Issuance Costs Proceeds from Issuance of Common Stock Payment of Common Dividends Payments of Ordinary Dividends, Common Stock Payment of Preferred Dividends Payments of Ordinary Dividends, Preferred Stock and Preference Stock Construction Advances and Contributions-Net NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities NET CHANGES IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITY: Utility Plant received as Construction Advances and Contributions Non-Cash Consideration for Sale of Subsidiary SUPPLEMENTAL DISCLOSURE OF CASH FLOWS INFORMATION: Cash Paid During the Year for: Cash Paid During the Year for: Interest Interest Capitalized Income Taxes Income Taxes Paid, Net Allowance for funds used during construction Statement [Table] Class of Stock [Axis] Convertible Preferred Stock $7.00 Series [Member] Nonredeemable Preferred Stock $7.00 Series [Member] Nonredeemable Preferred Stock $4.75 Series [Member] Preferred shares that are not redeemable before liquidation of the entity. Preferred shares may provide a preferential dividend to the dividend on common stock and may take precedence over common stock in the event of a liquidation. Preferred shares typically represent an ownership interest in the company. Debt Instrument [Axis] First Mortgage Bonds [Member] First Mortgage Bonds [Member] Amortizing Secured Notes [Member] Amortizing Secured Notes [Member] State Revolving Trust Notes [Member] State Revolving Trust Notes [Member] Construction Loans [Member] Construction Loans [Member] Statement [Line Items] SUBTOTAL LONG-TERM DEBT Add: Premium on Issuance of Long-term Debt Less: Unamortized Debt Expense Debt Instrument, Unamortized Discount Less: Current Portion of Long-term Debt Long-Term Debt, Current Maturities First Mortgage Bonds due 2021-2059 [Member] First Mortgage Bonds due 2021-2059 [Member] Amortizing Secured Notes due 2021-2040 [Member] Amortizing Secured Notes due 2021-2040 [Member] State Revolving Trust Notes due 2022-2038 [Member] State Revolving Trust Notes due 2022-2038 [Member] State Revolving Fund Bond due 2021 [Member] State Revolving Fund Bond due 2021 [Member] Range [Axis] Statistical Measurement [Axis] Minimum [Member] Maximum [Member] Common Stock, Shares Authorized Common Stock, Shares Outstanding Preferred Stock, Shares Authorized Preferred Stock, Shares Outstanding Interest rate Long term debt maturity period Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Common Stock [Member] Retained Earnings [Member] Balance, shares Balance, shares Shares, Outstanding Dividend Reinvestment & Common Stock Purchase Plan Dividend Reinvestment & Common Stock Purchase Plan, shares Restricted Stock Award - Net - Employees Restricted Stock Award - Net - Employees, shares Cash Dividends on Common Stock Dividends, Common Stock, Cash Cash Dividends on Preferred Stock Dividends, Preferred Stock, Cash