Document And Entity Information [Abstract] Document And Entity Information [Abstract]. Document Type Document Quarterly Report Document Transition Report Document Period End Date Entity File Number Entity Registrant Name Entity Incorporation State Country Code Entity Central Index Key Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Three 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 Amendment Flag Current Fiscal Year End Date Entity a Well-known Seasoned Issuer Entity a Voluntary Filer Entity Reporting Status Current Entity Filer Category Entity Small Business Entity Shell Company Entity Emerging Growth Company Entity Public Float Entity Closing Market Price (per share) Entity Closing Market Price (per share) Entity Common Stock, Shares Outstanding Entity Interactive Data Current Document Fiscal Period Focus Document Fiscal Year Focus Documents Incorporated By Reference Text Block Income Statement [Abstract] Operating 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 Operating Income Operating Income Other Income (Expense): Allowance for Funds Used During Construction Other Income (Expense), net Total Other Income, net Nonoperating Income (Expense) Interest Charges Income before Income Taxes 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: 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 doubtful accounts of $2,183 and $2,053, 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 Restricted Cash 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 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 doubtful 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 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 & 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 & 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 $531 in 2021, $429 in 2020 Capital Expenditures 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 Common Stock Issuance Expense Payments of Stock 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 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 Long-term Debt Deobligation Refers to value of long term debt deobligation in noncash investing and financing activities. 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] Amortizing Secured Note, due December 20, 2021 [Member] Secured Debt Zero [Member] Amortizing Secured Note, due May 19, 2028 [Member] Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity''s assets. Amortizing Secured Note, due August 25, 2030 [Member] Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity''s assets. Amortizing Secured Note, due September 19, 2031 [Member] Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity''s assets. State Revolving Trust Note, due December 31, 2022 [Member] Refers to state revolving trust note. State Revolving Trust Note, due May 1, 2025 [Member] Refers to state revolving trust note. State Revolving Trust Note, due March 1, 2026 [Member] State Revolving Trust Note 9 [Member]. State Revolving Trust Note, due January 25, 2027 [Member] Refers to state revolving trust note. State Revolving Trust Note, due December 1, 2026 [Member] Refers to state revolving trust note. State Revolving Trust Bond 4.00% to 5.00%, due August 1, 2021 [Member] Refers to state revolving trust bond. State Revolving Trust Bond 0.00%, due August 1, 2021 [Member] Refers to state revolving trust bond. State Revolving Trust Note, due July 1, 2028 [Member] Refers to state revolving trust note. State Revolving Trust Note, due January 1, 2028 [Member] Refers to state revolving trust note. State Revolving Trust Note, due August 1, 2031 [Member] Refers to state revolving trust note. Amortizing Secured Note, due April 20, 2029 [Member] Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity''s assets. Amortizing Secured Note 7.05%, due January 20, 2030 [Member] Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity''s assets. Amortizing Secured Note 5.69%, due January 20, 2030 [Member] Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity''s assets. Amortizing Secured Note, due April 20, 2040 [Member] Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity''s assets. Amortizing Secured Note, due April 20, 2040 [Member] Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity''s assets. State Revolving Trust Note, due December 1, 2026 [Member] [Default Label] State Revolving Trust Note, due July 1, 2031 [Member] Refers to state revolving trust note. State Revolving Trust Note, due February 1, 2036 [Member] State Revolving Trust Note, due February 1, 2036 [Member] State Revolving Trust Note, due November 1, 2038 [Member] State Revolving Trust Note, due November 1, 2038 [Member] State Revolving Trust Note, due November 30, 2030 [Member] Refers to state revolving trust note. Construction Loans [Member] Construction Loans [Member] First Mortgage Bonds - Series BB [Member] Loan secured by real property that has a first (highest) lien on such property in the event of default by the borrower. First Mortgage Bonds - Series CC [Member] Loan secured by real property that has a first (highest) lien on such property in the event of default by the borrower. First Mortgage Bonds - Series EE [Member] Loan secured by real property that has a first (highest) lien on such property in the event of default by the borrower.