Document And Entity Information Document Information [Table] Document Information [Line Items] Document Type Document Quarterly Report Document Period End Date Document Transition Report Securities Act File Number Entity Registrant Name Entity Incorporation, State or 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 Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Condensed Consolidated Balance Sheets Statement [Table] Statement [Line Items] Statement Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Restricted Cash and Cash Equivalent, Current Restricted cash Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable from contracts with customers - ending balance Accounts receivable from contracts with customers - beginning balance Accounts receivable Energy Related Inventory, Coal Inventory Inventory, Supplies, Net of Reserves Parts and supplies Prepaid Expense, Current Prepaid expenses Assets, Current Total current assets Property, Plant and Equipment [Abstract] Property, plant and equipment: Mineral Rights Land and mineral rights Amount before accumulated depreciation of building structures held for productive use and tangible personal property used to produce goods and services. Buildings and equipment Buildings and equipment Amount before accumulated depreciation of costs for developing new mines and expanding the capacity of existing mines. Mine Development, Gross Mine development Construction in Progress, Gross Construction work in progress Finance Lease, Right-of-Use Asset, after Accumulated Amortization Finance lease right-of-use assets Property, Plant and Equipment, Gross Total property, plant and equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less - accumulated depreciation, depletion and amortization Property, Plant and Equipment, Net Total property, plant and equipment, net Equity Method Investments. Equity method investments Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Other Assets, Noncurrent Other noncurrent assets Assets Total assets Assets Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities, Current [Abstract] Current liabilities: Secured Debt, Current Current portion of bank debt, net Accounts Payable, Current Accounts payable Accrued Liabilities and Other Liabilities Accrued liabilities and other Total accrued liabilities and other Finance Lease, Liability, Current Current portion of lease financing Contract with Customer, Liability, Current Contract liabilities - current Liabilities, Current Total current liabilities Liabilities, Noncurrent [Abstract] Long-term liabilities: Secured Long-Term Debt, Noncurrent Bank debt, net Finance Lease, Liability, Noncurrent Long-term lease financing Deferred Income Tax Liabilities, Net Deferred income taxes Asset Retirement Obligations, Noncurrent Asset retirement obligations Contract liabilities - long-term Contract liabilities - long-term Other Liabilities, Noncurrent Other Liabilities, Noncurrent Total long-term liabilities Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 14) Equity, Attributable to Parent [Abstract] Stockholders' equity: Redeemable Noncontrolling Interest, Equity, Carrying Amount Preferred stock, $.10 par value, 10,000 shares authorized; none issued Common Stock, Value, Issued Common stock, $.01 par value, 100,000 shares authorized; 47,144 and 43,817 issued and outstanding, as of June 30, 2026 and December 31, 2025, respectively Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Retained deficit Equity, Attributable to Parent Balance at the end Balance at the beginning Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding Condensed Consolidated Statements of Operations Product and Service [Axis] Product and Service [Domain] Represents electric sales. Electric Sales [Member] Electric sales Represents coal sales. Coal Sales [Member] Coal sales Coal sales Revenues [Abstract] SALES AND OPERATING REVENUES: Revenue from Contract with Customer, Excluding Assessed Tax Revenues Operating Revenues Other Operating Income Other revenues Other operating revenue Revenues Total sales and operating revenues Costs and Expenses [Abstract] EXPENSES: Fuel Costs Fuel Fuel Utilities Operating Expense, Maintenance and Operations Other operating and maintenance costs Other operating and maintenance costs Amount of costs incurred for purchase of power that are directly related to goods produced and sold and services rendered during the reporting period. Cost of Purchased Power Cost of purchased power Cost of purchased power Direct Communications and Utilities Costs Utilities Utilities Labor and Related Expense Labor Labor Depreciation, Depletion and Amortization Depreciation, depletion and amortization Depreciation, depletion and amortization Asset Retirement Obligation, Accretion Expense ARO accretion Asset retirement obligations accretion Exploration Expense Exploration costs Exploration costs Selling, General and Administrative Expense General and administrative Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal (Gain) loss on disposal or abandonment of assets, net Gain on disposal or abandonment of assets, net Gain (loss) on disposal or abandonment of assets, net Costs and Expenses Total operating expenses Operating Income (Loss) INCOME (LOSS) FROM OPERATIONS Investment Income, Interest Interest income Interest Expense, Operating and Nonoperating Interest expense Interest expense Total interest expense Gain (Loss) on Extinguishment of Debt Loss on extinguishment of debt Loss on extinguishment of debt Income (Loss) from Equity Method Investments Equity method investment loss Equity method investment (loss) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (Loss) before Income Taxes NET INCOME (LOSS) BEFORE INCOME TAXES Income Tax Expense (Benefit), Continuing Operations [Abstract] INCOME TAX EXPENSE (BENEFIT): Deferred Income Tax Expense (Benefit) Deferred Deferred income tax (benefit) Income Tax Expense (Benefit) Total income tax expense (benefit) NET INCOME (LOSS) Net income (loss) - basic NET INCOME (LOSS) PER SHARE NET INCOME (LOSS) PER SHARE: Earnings Per Share, Basic Basic (in dollar per share) Basic earnings (loss) per common share (in dollars per share) Earnings Per Share, Diluted Diluted (in dollar per share) Diluted net income (loss) per share (in dollars per share) Weighted Average Number of Shares Outstanding Reconciliation [Abstract] WEIGHTED AVERAGE SHARES OUTSTANDING Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Weighted average shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Weighted average shares outstanding - diluted (in shares) Interest Expense, Operating and Nonoperating [Abstract] Interest Expense: Interest Expense, Debt, Excluding Amortization Interest on bank debt Interest Expense, Other Other interest Amortization of Debt Issuance Costs Amortization of debt issuance costs Condensed Consolidated Statements of Cash Flows Sale of Stock [Axis] Sale of Stock [Domain] Represents the share offering classified as ATM (At-the-market). At Market Offering [Member] ATM Represents a confidentially marketed public offering. Confidentially Marketed Public Offering [Member] Confidentially marketed public offering Net Cash Provided by (Used in) Operating Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Asset Retirement Obligation, Cash Paid to Settle Cash paid on asset retirement obligation reclamation Share-Based Payment Arrangement, Noncash Expense Stock-based compensation Capitalized Contract Cost, Amortization Amortization of contract liabilities Accretion Expense Accretion on contract liabilities Operating Lease, Right-of-Use Asset, Periodic Reduction Amortization of right-of-use assets Other Noncash Income (Expense) Other Increase (Decrease) in Operating Capital [Abstract] Change in current assets and liabilities: Increase (Decrease) in Accounts and Notes Receivable Accounts receivable Increase (Decrease) in Inventories Inventory Increase (Decrease) in Materials and Supplies Parts and supplies Increase (Decrease) in Prepaid Expense Prepaid expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued liabilities Increase (Decrease) in Contract with Customer, Liability Contract liabilities Net Cash Provided by (Used in) Operating Activities Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: Payments to Acquire Property, Plant, and Equipment Capital expenditures Proceeds from Sale of Machinery and Equipment Proceeds from sale of equipment Payments to Acquire Equity Method Investments Investment in equity method investments Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Repayments of Bank Debt Payments on bank debt Proceeds from Bank Debt Borrowings of bank debt Finance Lease, Principal Payments Payments on lease financing Payments of Debt Issuance Costs Debt issuance costs Sale of Stock, Consideration Received on Transaction Proceeds from offering, net of issuance costs Net proceeds of common stock under ATM Program Payment, Tax Withholding, Share-Based Payment Arrangement Taxes paid on vesting of RSUs Net Cash Provided by (Used in) Financing Activities Net cash (used in) provided by financing activities Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Increase in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cash, cash equivalents, and restricted cash, end of period Cash, cash equivalents, and restricted cash, beginning of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] CASH, CASH EQUIVALENTS, AND RESTRICTED CASH: Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Total cash and cash equivalent and restricted cash balances on deposit with financial institutions Cash, Cash Equivalents and Restricted Cash Supplemental Cash Flow Information [Abstract] SUPPLEMENTAL CASH FLOW INFORMATION: Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for interest Noncash Investing and Financing Items [Abstract] SUPPLEMENTAL NON-CASH FLOW INFORMATION: Change in capital expenditures included in accounts payable and prepaid expense Change in capital expenditures included in accounts payable and prepaid expense Non-cash change in capital expenditures included in accounts payable and prepaid expense Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-use asset additions Condensed Consolidated Statements of Stockholders' Equity Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Common Stock Issued Additional Paid-in Capital [Member] Additional Paid-in Capital Retained Earnings [Member] Retained Deficit Shares, Outstanding Balance at the end (in shares) Balance at the beginning (in shares) APIC, Share-Based Payment Arrangement, Option, Increase for Cost Recognition Stock-based compensation Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Stock issued on vesting of RSUs Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock issued on vesting of RSUs (in shares) Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Taxes paid on vesting of RSUs Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Taxes paid on vesting of RSUs (in shares) Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Issuance costs related to ATM offering Stock Issued During Period, Value, New Issues Stock issued in ATM offering, net of issuance costs Stock Issued During Period, Shares, New Issues Stock issued in ATM offering, net of issuance costs (in shares) BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] BASIS OF PRESENTATION RECENT ACCOUNTING PRONOUNCEMENTS Accounting Standards Update and Change in Accounting Principle [Text Block] RECENT ACCOUNTING PRONOUNCEMENTS INVENTORY Inventory Disclosure [Text Block] INVENTORY BANK DEBT Debt Disclosure [Text Block] BANK DEBT ACCRUED LIABILITIES AND OTHER The entire disclosure for accrued expenses, and other liabilities that are classified as current at the end of the reporting period. Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] ACCRUED LIABILITIES AND OTHER REVENUE Revenue from Contract with Customer [Text Block] REVENUE INCOME TAXES Income Tax Disclosure [Text Block] INCOME TAXES STOCK COMPENSATION PLANS Share-Based Payment Arrangement [Text Block] STOCK COMPENSATION PLANS N/A SELF-INSURANCE The entire disclosure for self insurance. Self Insurance [Text Block] SELF-INSURANCE FAIR VALUE MEASUREMENTS Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] FAIR VALUE MEASUREMENTS EQUITY METHOD INVESTMENTS Equity Method Investments and Joint Ventures Disclosure [Text Block] EQUITY METHOD INVESTMENTS SEGMENTS OF BUSINESS Segment Reporting Disclosure [Text Block] SEGMENTS OF BUSINESS Earnings Per Share [Text Block] NET INCOME (LOSS) PER SHARE COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES No definition available. AT MARKET AGREEMENT ("ATM") AND CONFIDENTIALLY MARKETED PUBLIC OFFERING ("CMPO") Equity [Text Block] AT MARKET AGREEMENT ("ATM") AND CONFIDENTIALLY MARKETED PUBLIC OFFERING ("CMPO") Reclassification, Comparability Adjustment [Policy Text Block] Reclassifications Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Use of Estimates, Policy [Policy Text Block] Use of Estimates Disclosure of accounting policy for the change in accounting estimates in the preparation of financial statements in conformity with generally accepted accounting principles. Change in Accounting Estimate [Policy Text Block] Change in Accounting Estimate New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements - Not Yet Adopted Schedule of Debt [Table Text Block] Schedule of debt Schedule of Maturities of Long-Term Debt [Table Text Block] Schedule of maturities of long-term debt Tabular disclosure for accrued expenses, and other liabilities that are classified as current at the end of the reporting period. Accrued Liabilities, and Other Liabilities, Current [Table Text Block] Schedule of accrued liabilities Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Schedule of revenue by major customers Revenue from External Customers by Geographic Areas [Table Text Block] Schedule of revenue by geographic area Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Schedule of remaining performance obligation disaggregated by segment and contract duration Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Schedule of beginning and ending accounts receivable and contract liabilities Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Schedule of Non-vested activity table Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Schedule of Non-vested RSU vesting years Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of key metrics reviewed by CODM Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Schedule of reconciliation of segment revenues to consolidated Tabular disclosure of information about reportable segment EBITDA. Segment Reporting, Schedule Of Reportable Segment EBITDA [Table Text Block] Schedule of segment EBITDA Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Schedule of EBITDA Margin to Income (loss) before Income Taxes Long-Lived Assets by Geographic Areas [Table Text Block] Schedule of segment assets and capital expenditures Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of earnings (loss) per share Disclosure for the general note to the financial statements for the reporting entity for the nature of business. GENERAL BUSINESS [Table] Investment, Name [Axis] Investment, Name [Domain] Represents Sunrise Energy, LLC. Sunrise Energy, LLC [Member] Sunrise Energy, LLC Revision of Prior Period [Axis] Revision of Prior Period [Domain] Revision of Prior Period, Error Correction, Adjustment [Member] Revision of prior period error correction adjustment Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Represents information pertaining to Master Power Purchase and Sale Agreement. Master Power Purchase and Sale Agreement [Member] Master Power Purchase and Sale Agreement Effect of Change in Accounting Estimate, Type [Axis] Effect of Change in Accounting Estimate, Type [Domain] Service Life [Member] Service Life Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. General Business [Line Items] BASIS OF PRESENTATION Equity Method Investment, Ownership Percentage Percentage of equity method investment Period covered by long-term supply commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Long Term Supply Commitment, Contract Term Long term supply commitment, contract term Inventory Adjustments Inventory adjustments Inventory Write-down Inventory downward adjustment BANK DEBT [Table] Debt Instrument [Axis] Debt Instrument, Name [Domain] Represents the credit agreement. Credit Agreement [Member] Credit Agreement Represents the third amendment of the credit agreement. Third Amendment to the Credit Agreement [Member] Third Amendment Represents the new credit facility. New Credit Facility [Member] New Credit Facility Represents base rate loans. Base Rate Loan [Member] Base rate loans Represents SOFR loans. SOFR Loan [Member] SOFR loans Represents the second amendment of the credit agreement. Second Amendment To Credit Agreement [Member] Second amendment Credit Facility [Axis] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving credit Letter of Credit [Member] Letter of credit Variable Rate [Axis] Variable Rate [Domain] Represents the federal funds rate. Federal Funds Rate [Member] Federal Funds Rate Base Rate [Member] Base rate Secured Overnight Financing Rate (SOFR) [Member] SOFR rate Represents a physically delivered prepaid power contract of the entity. Physically Delivered Prepaid Power Contract [Member] Physically Delivered Prepaid Power Contract Long-Term Debt, Type [Axis] Long-Term Debt, Type [Domain] Delayed Draw Term Loan (DDTL) [Member] Delayed Draw Term Loan Short-Term Debt, Type [Axis] Short-Term Debt, Type [Domain] Represents swing line loans. Swingline Loans [Member] Swingline loans Statistical Measurement [Axis] Statistical Measurement [Domain] Minimum [Member] Minimum Maximum [Member] Maximum Scenario [Axis] Scenario [Domain] Represents the period after June 30, 2026. Period After June 30, 2026 [Member] Period after June 30, 2026 Represents the periods ending June 30, 2026 through september 30, 2026. Periods Ending June 30, 2026 Through September 30, 2026 [Member] Periods ending june 30, 2026 through september 30, 2026 Represents the periods ending december 31, 2026 through march 31, 2027. Periods Ending December 31, 2026 Through March 31, 2027 [Member] Periods ending december 31, 2026 through march 31, 2027 Represents the periods ending on or after June 30, 2027. Periods Ending On or After June 30, 2027 [Member] Periods ending on or after june 30, 2027 Represents information pertaining to fourth quarter of 2026. Fourth Quarter Of 2026 [Member] Fourth quarter of 2026 Represents information pertaining to second quarter of 2027. Second Quarter Of 2027 [Member] Second quarter of 2027 Debt Instrument [Line Items] BANK DEBT Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing capacity Debt Instrument, Face Amount Principal amount of debt instrument Amount of additional borrowing capacity subject to conditions. Line of Credit Facility, Additional Borrowing Capacity Additional revolving facility commitments Debt Instrument, Basis Spread on Variable Rate Interest rate Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Commitment fees, percentage Debt Instrument, Interest Rate, Effective Percentage All in rate Repayments of Lines of Credit Repayment of revolving credit Percentage of original principal amount to be repaid every quarter. Debt Instrument, Percentage Of Original Principal Amount To Be Repaid Every Quarter Percentage of original principal amount to be repaid every quarter Debt Instrument, Periodic Payment, Principal Principal periodic payment Represents the debt instrument, covenant, debt leverage ratio. Debt Instrument Covenant, Leverage Ratio Total leverage ratio Represents the debt instrument covenant, senior secured coverage ratio. Debt Instrument Covenant Senior Secured Leverage Ratio Senior secured leverage ratio The prepaid amount received for the long-term supply agreement. Long Term Supply Agreement, Prepaid Contract, Amount Prepaid contract The cash outflow associated with payments in deposits of money market accounts. Payments for Money Market Deposits Deposited in money market Letters of Credit Outstanding, Amount Outstanding letters of credit Debt Instrument, Unused Borrowing Capacity, Amount Additional borrowing capacity The amount of liquidity under the debt instrument. Debt Instrument Liquidity Debt Instrument, Liquidity Debt Issuance Costs, Gross Unamortized bank fees and other costs Unamortized Debt Issuance Expense Unamortized bank fees Debt Issuance Costs, Current, Net Less unamortized debt issuance cost Unamortized debt issuance cost, current Debt Issuance Costs, Noncurrent, Net Less unamortized debt issuance cost Unamortized debt issuance cost, non current Represents the debt instrument covenant, fixed charge coverage ratio. Debt Instrument Covenant Fixed Charge Coverage Ratio Fixed charge coverage ratio Percentage of floor on the variable rate. Debt Instrument, Variable Rate, Floor Rate Percentage of floor on the variable rate Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Current bank debt Long-Term Debt, Current Maturities Net current portion Amount before unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Long-term bank debt Long-Term Debt, Excluding Current Maturities Net long-term portion Long-Term Debt, Gross Total bank debt Debt Issuance Costs, Net Less total unamortized debt issuance cost Long-Term Debt Net bank debt Long-Term Debt, Maturity, Remainder of Fiscal Year 2026 Long-Term Debt, Maturity, Year One 2027 Long-Term Debt, Maturity, Year Two 2028 Long-Term Debt, Maturity, Year Three 2029 Accrued Liabilities Accrued liabilities Workers' Compensation Liability Workers' compensation reserve Taxes Payable Accrued property taxes Accrued Payroll Taxes Accrued payroll Asset Retirement Obligation, Current ARO - current portion Accrued Employee Benefits Group health insurance Operating Lease, Liability, Current Operating lease liability - current portion Other Accrued Liabilities, Current Other Disaggregation of Revenue [Table] Represents delivered energy. Delivered Energy [Member] Delivered energy revenue Delivered energy Represents accredited capacity revenue. Accredited Energy Capacity [Member] Accredited capacity Accredited capacity revenue Segments [Axis] Segments [Domain] Represents electric operations. Electric Operations [Member] Electric Operations Electric Operations Disaggregation of Revenue [Line Items] REVENUE Geographical [Axis] Geographical [Domain] INDIANA Third-party Indiana customers Represents other customers. Other Third Party Indiana Customers [Member] Other customers Represents coal operations Coal Operations [Member] Coal Operations Coal Operations Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Consolidation Items [Axis] Consolidation Items [Domain] Operating Segments [Member] Operating Segment Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] REVENUE Revenue, Remaining Performance Obligation, Amount Revenue expected to be recognized Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Unsatisfied or partially unsatisfied performance obligation, period Contract with Customer, Liability Total contract liabilities - ending balance Total contract liabilities - beginning balance Amount of increase in contract with customer liability due to cash received from customers as progress payments for future contractual obligations, during the reporting period. Contract with Customer, Liability, Proceeds from Customers for Future Contractual Obligations Cash payments received on future contract obligations Amount of increase through recognition of expense for the passage of time, typically for liabilities, that have been discounted to their net present values attributable to contract with customer liabilities for the reporting period. Contract with Customer, Liability, Accretion Accretion on contract liabilities Contract with Customer, Liability, Revenue Recognized Revenue recognized, cash payment received in prior period Amount of revenue recognized that was from current period increase in the balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Revenue Recognized from Current Period Increase in Contract Liability Revenue recognized, cash payment received in current period Income Tax Paid, by Individual Jurisdiction [Table] Income Tax Paid, by Individual Jurisdiction [Line Items] Effective Income Tax Rate Reconciliation, Percent Effective income tax rate reconciliation, percent Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Restricted Stock Units (RSUs) [Member] Restricted stock units Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] STOCK COMPENSATION PLANS Share-Based Payment Arrangement, Expense Stock-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Unrecognized stock compensation expense Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Number of shares available for grants (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Shares outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Non-vested grants - Ending (in shares) Non-vested grants - Beginning (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Awarded (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited (in shares) Vesting [Axis] Vesting [Domain] Represents vesting in 2026. Represents vesting in 2026 [Member] 2026 The RSU's vesting in 2027. Represents vesting in 2027 [Member] 2027 The RSU's vesting in 2028. Represents vesting in 2028 [Member] 2028 Represents information pertaining to vesting in 2029. Represents vesting in 2029 [Member] 2029 The number of equity-based payment instruments, excluding stock (or unit) options, that are to vest in a future period. RSUs vesting (in shares) Disclosure for the general note to the financial statements for the self-insurance taken by the entity. Self Insurance [Table] Restricted Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Represents future workers' compensation claim payments Future workers' compensation claim payments Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Self Insurance [Line Items] SELF-INSURANCE Self Insurance Reserve Self-insurance liabilities Maximum liability per workers' compensation claim Maximum liability per workers' compensation claim Maximum liability per workers' compensation claim Maximum annual liability for workers' compensation claims Maximum annual liability for workers' compensation claims Maximum annual liability for workers' compensation claims Workers' Compensation Liability, Current Workers' compensation reserve Equity Method Investment [Table] Represents Oaktown Gas, LLC. Oaktown Gas, LLC [Member] Oaktown Gas, LLC Schedule of Equity Method Investments [Line Items] EQUITY METHOD INVESTMENTS Number of Operating Segments Number of segments Number of Reportable Segments Number of reportable segments The number of units of the Merom power plant operated by the entity. Merom Power Plant, Number Of Units Merom power plant - number of units The mega-watt capacity of the Merom power plant operated by the entity. Merom Power Plant, Electricity Generation Capacity Merom power plant - megawatt capacity Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] SEGMENTS OF BUSINESS Other Cost of Operating Revenue Other operating costs The amount of total variable costs incurred by the entity during the reporting period. Variable Costs, Total Total variable costs The amount of margin earned by the entity before deduction for general and administrative costs during the reporting period. Margin Before General And Administrative Expense Segment margin without general and administrative General and Administrative Expense General and administrative The amount of earnings before interest, tax, depreciation and amortization attributable to the entity during the reporting period. Earnings Before Interest, Tax, Depreciation And Amortization Total Segment EBITDA Segment EBITDA Segment EBITDA Reconciliation of Revenue from Segments to Consolidated [Table] Represents the aggregate total of reconciling items and elimination items. Eliminations and Reconciling Items [Member] Corporate and Other Eliminations Corporate and Other and Eliminations Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] Nonrelated Party [Member] Third-Party Related Party [Member] Intercompany Segment Reporting, Revenue Reconciling Item [Line Items] SEGMENTS OF BUSINESS Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] SEGMENTS OF BUSINESS Other Nonoperating Income (Expense) All other The amount of general and administrative expenses related to corporate activities during the reporting period. Corporate Costs, General and Administrative Corporate - general and administrative Schedule of Revenues from External Customers and Long-Lived Assets [Table] Revenues from External Customers and Long-Lived Assets [Line Items] SEGMENTS OF BUSINESS Property, Plant and Equipment, Additions Capital Expenditures Earnings Per Share, Basic [Abstract] Basic earnings per common share: Earnings Per Share, Diluted [Abstract] Diluted earnings per common share: Net Income (Loss) Attributable to Parent, Diluted Net income (loss) - diluted Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Add: Dilutive effects of Restricted Stock Units (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive securities excluded from computation of earnings per share Asset Acquisition [Table] Asset Acquisition [Axis] Asset Acquisition [Domain] Represents acquisition of turbine equipment. Acquisition Of Turbine Equipment [Member] Acquisition of Turbine Equipment Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Events Asset Acquisition [Line Items] The maximum electric power generated from the assets purchased. Electricity Generation Plant Nominal Capacity Nominal capacity Asset Acquisition, Consideration Transferred Asset acquisition purchase price Asset Acquisition, Consideration Transferred, Transaction Cost Asset acquisition additional cost Payments to Acquire Productive Assets Asset acquisition payment Subsequent Event [Table] Subsequent Event [Line Items] COMMITMENTS AND CONTINGENCIES Litigation Settlement, Amount Awarded to Other Party Litigation settlement amount Payments for Legal Settlements Payments for settlement in escrow Loss Contingency Accrual Amount accrued on settlement litigation Collaborative Arrangement and Arrangement Other than Collaborative [Table] Counterparty Name [Axis] Counterparty Name [Domain] Represents B. Riley Securities Inc. B. Riley Securities, Inc. [Member] B. Riley Securities, Inc. Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] AT MARKET AGREEMENT ("ATM") AND CONFIDENTIALLY MARKETED PUBLIC OFFERING ("CMPO") Represents the maximum aggregate gross proceeds relating to the equity sales agreement. Equity Sales Agreement Maximum Aggregate Gross Proceeds Aggregate gross proceeds The number of days/weeks/months/years of notice required to terminate an ATM offering. Atm Offering Notice for Termination Period of sale agreement Shares Issued, Price Per Share Price per share Proceeds from Issuance of Common Stock ATM offering Payments of Stock Issuance Costs Offering expenses Represents Heath Lovell. Heath Lovell [Member] Heath Lovell