Document And Entity Information us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Statistical Measurement [Axis] Note To Financial Statement Details Textual Significant Accounting Policies Note 2 - Summary of Significant Accounting Policies Income taxes ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 3 - Stockholders' Equity ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 4 - Unproved Oil and Gas Properties, Full Cost Method Trading Arrangements, by Individual [Table] Note 5 - Right of Use Lease Assets and Lease Obligations Material Terms of Trading Arrangement [Text Block] Note 7 - Operating Segments Note 2 - Summary of Significant Accounting Policies - Schedule of Property and Equipment Movement (Details) Note 3 - Stockholders' Equity - Stock Option Roll Forward (Details) Note 3 - Stockholders' Equity - Schedule of Outstanding and Exercisable Options (Details) Note 3 - Stockholders' Equity - Option Valuation Assumptions (Details) Note 3 - Stockholders' Equity - Schedule of Share-based Compensation Costs (Details) Note 3 - Stockholders' Equity - Schedule of Warrant Activity (Details) Foreign exchange (expenses), income Statistical Measurement [Domain] Note 4 - Unproved Oil and Gas Properties, Full Cost Method - Schedule of Unproven Properties (Details) Maximum [Member] Weighted-average fair value of underlying stock at grant date (in dollars per share) Note 4 - Unproved Oil and Gas Properties, Full Cost Method - Schedule of Changes to Oil and Gas Properties (Details) Note 5 - Right of Use Lease Assets and Lease Obligations - Schedule of Operating Lease Assets and Liabilities (Details) Note 5 - Right of Use Lease Assets and Lease Obligations - Schedule of Lease Information (Details) Note 5 - Right of Use Lease Assets and Lease Obligations - Schedule of Future Minimum Lease Payments (Details) Note 7 - Operating Segments - Schedule of Operating Segment Expenses (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] us-gaap_CostMaintenance IT and maintenance Granted to employees, officers, directors and others, weighted average exercise price (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) Exercised, weighted average exercise price (in dollars per share) Dallas Office Lease Seventeenth Floor [Member] Represents the seventeenth floor for the Dallas office lease. Dallas Office Lease Fourteenth Floor [Member] Represents the fourteenth floor for the Dallas office lease. us-gaap_LaborAndRelatedExpense Salaries and wages znog_LeaseAgreementAbatedRent Lease Agreement, Abated Rent (Month) The length of abated rent due at the beginning of the lease term. Dallas Office Lease [Member] Represents the Dallas office lease. Prepaid Expenses [Policy Text Block] The accounting policy describing the prepaid expenses. ZNWBC Warrants [Member] Represents the ZNWBC warrants. us-gaap_SecurityDeposit Security Deposit us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Segment Reporting [Text Block] us-gaap_IncreaseDecreaseInOtherReceivables Other receivables znog_MonthlyRentPerSquareFoot Monthly Rent Per Square Foot Represents the amount of monthly rent per square foot. Segment Reporting [Table Text Block] Award Type [Axis] Adjustments to reconcile net loss to net cash used in operating activities: Plan Name [Axis] us-gaap_Liabilities Total liabilities Plan Name [Domain] us-gaap_WarrantsAndRightsOutstandingTerm Warrants and Rights Outstanding, Term (Year) Stock-based compensation costs us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ equity Oil and Gas, Full Cost Method, Property and Equipment [Text Block] znog_PolicyTable Title and Position [Axis] Segment Reporting [Table] Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Table Text Block] Cost of options issued to employees, directors and others as non-cash compensation Subsequent Event [Member] Liabilities and Stockholders’ Equity us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization, Period Cost Lessee, Lease, Description [Table] us-gaap_DevelopmentCosts Legal and seismic costs, license fees and other preparation costs us-gaap_ProductionCosts Drilling costs, and other operational related costs us-gaap_ExplorationCosts Capitalized salary costs Lease Contractual Term [Axis] Lease Contractual Term [Domain] Amortization of Right of Use Lease Assets Amount of periodic reduction over lease term of carrying amount of right-of-use asset from operating lease net of reversals. Change in assets and liabilities, net: Accounts payable us-gaap_IncreaseDecreaseInAccountsPayable Unpaid investments in drilling rig and related equipment Represents the cash flow effect of unpaid investments in drilling and rig equipment. us-gaap_FiniteLivedIntangibleAssetUsefulLife Finite-Lived Intangible Asset, Useful Life (Year) us-gaap_TaxesOther Payroll taxes Accrued liabilities us-gaap_IncreaseDecreaseInAccruedLiabilities us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation us-gaap_GuarantyLiabilities Guaranty Liabilities New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash, cash equivalents and restricted cash – beginning of period Cash, cash equivalents and restricted cash – end of period Antidilutive Securities, Name [Domain] Statement [Table] us-gaap_OperatingLeasePayments Operating Lease, Payments us-gaap_PrepaidRent Prepaid Rent znog_PropertyPlantAndEquipmentSelfConsumptionDisposals Property, Plant, and Equipment, Self Consumption Disposals Asset Disposals for Self-Consumption Represents the amount of property, plant, and equipment disposed of during the period for self consumption. Nature of Operations [Text Block] Product and Service [Domain] Product and Service [Axis] us-gaap_LegalFees Legal Fees us-gaap_PropertyPlantAndEquipmentUsefulLife Property, Plant and Equipment, Useful Life (Year) Thereafter, minimum lease payment Share-Based Payment Arrangement, Option, Exercise Price Range [Table] us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total undiscounted future minimum lease payments Options outstanding (in shares) Upper range (in dollars per share) Exercise Price Range [Domain] Exercise Price Range [Axis] Weighted average discount rate Weighted-average grant date fair value (in dollars per share) Asset Class [Axis] 2026, minimum lease payment 2030, minimum lease payment us-gaap_OperatingLeaseExpense Office facilities and rent Exercisable (in shares) Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Exercisable, weighted average exercise price (in dollars per share) 2028, minimum lease payment us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Outstanding (in shares) Outstanding (in shares) Commitments and Contingencies Disclosure [Text Block] 2027, minimum lease payment us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Outstanding, weighted average exercise price (in dollars per share) Outstanding, weighted average exercise price (in dollars per share) Statement [Line Items] 2029, minimum lease payment Common stock, issued (in shares) Grantee Status [Domain] Common stock, outstanding (in shares) Award Type [Domain] Share-Based Payment Arrangement, Employee [Member] Risk-free interest rates Common stock, authorized (in shares) Common Stock, Shares Authorized (in shares) Grantee Status [Axis] Warrants and Options [Member] Relating to warrants and options. us-gaap_IncreaseDecreaseInPrepaidExpensesOther Prepaid expenses and other Expected volatility Lessee, Operating Lease [Table Text Block] Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. znog_ForeignCurrencyFluctuationRateDuringThePeriod Foreign Currency Fluctuation Rate During the Period Represents the percentage of fluctuation of foreign currency rates during the period. Share-Based Payment Arrangement, Nonemployee [Member] Common stock, par value $.01; Authorized: 1,600,000,000 shares at June 30, 2026: Issued and outstanding: 1,190,034,995 and 1,156,476,572 shares at June 30, 2026 and December 31, 2025, respectively Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] us-gaap_ProceedsFromIssuanceOrSaleOfEquity Proceeds from Issuance or Sale of Equity Supplier [Axis] Supplier [Domain] Warrants [Member] Relating to warrants. Warrants, exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) Accounts payable Exercise Price Range 5 [Member] Relating to exercise price range 5. Exercise Price Range 4 [Member] Relating to exercise price range 4. Exercise Price Range 6 [Member] Relating to exercise price range 6. us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Exercise Price Range 3 [Member] Relating to exercise price range 3. us-gaap_TableTextBlock Notes Tables Exercise Price Range 2 [Member] Relating to exercise price range 2. Exercise Price Range 12 [Member] Relating to exercise price range 12. Exercise Price Range 11 [Member] Relating to exercise price range 11. Exercise Price Range 14 [Member] Relating to exercise price range 14. Exercise Price Range 13 [Member] Relating to exercise price range 13. Exercise Price Range 8 [Member] Relating to exercise price range 8. Exercise Price Range 7 [Member] Relating to exercise price range 7. Exercise Price Range 10 [Member] Relating to exercise price range 10. Exercise Price Range 9 [Member] Relating to exercise price range 9. Exercise Price Range 20 [Member] Relating to exercise price range 20. Exercise Price Range 19 [Member] Relating to exercise price range 19. Exercise Price Range 22 [Member] Relating to exercise price range 22. Subsequent Events [Text Block] Exercise Price Range 21 [Member] Relating to exercise price range 21. Concentration Risk Type [Axis] Accrued liabilities Exercise Price Range 16 [Member] Relating to exercise price range 16. Exercise Price Range 15 [Member] Relating to exercise price range 15. Exercise Price Range 18 [Member] Relating to exercise price range 18. Exercise Price Range 17 [Member] Relating to exercise price range 17. Exercise Price Range 28 [Member] Relating to exercise price range 28. Oil and Gas, Accounting Method, Full Cost or Successful Efforts [Policy Text Block] Exercise Price Range 27 [Member] Relating to exercise price range 27. Exercise Price Range 30 [Member] Relating to exercise price range 30. znog_CashCashEquivalentsAndShortTermInvestmentsInterestRateDuringPeriod Cash, Cash Equivalents, and Short Term Investments, Interest Rate During Period Represents the interest rate during the period for cash, cash equivalent, and short term investments. Exercise Price Range 29 [Member] Relating to exercise price range 29. Significant Accounting Policies [Text Block] Exercise Price Range 24 [Member] Relating to exercise price range 24. Exercise Price Range 23 [Member] Relating to exercise price range 23. Exercise Price Range 26 [Member] Relating to exercise price range 26. Exercise Price Range 25 [Member] Relating to exercise price range 25. us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less: portion representing imputed interest Exercise Price Range 36 [Member] Relating to exercise price range 36. Non-current operating lease liabilities Exercise Price Range 35 [Member] Relating to exercise price range 35. Total operating lease liabilities Total operating lease liabilities Exercise Price Range 38 [Member] Relating to exercise price range 38. Current operating lease liabilities Exercise Price Range 37 [Member] Relating to exercise price range 37. Exercise Price Range 32 [Member] Relating to exercise price range 32. Exercise Price Range 31 [Member] Relating to exercise price range 31. Exercise Price Range 34 [Member] Relating to exercise price range 34. Exercise Price Range 33 [Member] Relating to exercise price range 33. Exercise Price Range 43 [Member] Relating to exercise price range 43. Exercise Price Range 42 [Member] Relating to exercise price range 42. Exercise Price Range 45 [Member] Relating to exercise price range 45. Exercise Price Range 44 [Member] Relating to exercise price range 44. Expected lives (in years) (Year) Exercise Price Range 39 [Member] Relating to exercise price range 39. Exercise Price Range 41 [Member] Relating to exercise price range 41. Concentration Risk Type [Domain] Exercise Price Range 40 [Member] Relating to exercise price range 40. Accounts Payable [Member] Exercise Price Range 50 [Member] Relating to exercise price range 50. Exercise Price Range 47 [Member] Relating to exercise price range 47. Exercise Price Range 46 [Member] Relating to exercise price range 46. Exercise Price Range 49 [Member] Relating to exercise price range 49. Exercise Price Range 48 [Member] Relating to exercise price range 48. Intangible Asset, Finite-Lived, Class [Axis] Bank Guarantees to Governmental Bodies [Member] Relating to bank guarantees to governmental bodies. Statement of Stockholders' Equity [Abstract] znog_NumberOfMajorSuppliers Number of Major Suppliers Represents the number of major suppliers during the period. Intangible Asset, Finite-Lived, Class [Domain] Class of Warrant or Right [Axis] Four Suppliers [Member] Relating to four suppliers. Class of Warrant or Right [Domain] Three Suppliers [Member] Relating to three suppliers. Statement of Cash Flows [Abstract] Bank Guarantees [Member] Relating to bank guarantees. Bank Guarantees to Others [Member] Relating to bank guarantees to others. Stockholders’ equity Equity Components [Axis] Lease obligation – current and non-current Share-Based Payment Arrangement [Policy Text Block] Proceeds from exercise of stock options Equity Component [Domain] Equity [Text Block] us-gaap_ClassOfWarrantOrRightOutstanding Class of Warrant or Right, Outstanding (in shares) Additional Paid-in Capital [Member] Retained Earnings [Member] Lower range (in dollars per share) Drilling rig and related equipment, net of accumulated depreciation of $4,022 and $3,521 (see Note 2J) us-gaap_PropertyPlantAndEquipmentGross Balance Balance Subsequent Event Type [Domain] Subsequent Event [Table] Subsequent Event Type [Axis] Share-Based Payment Arrangement, Cost by Plan [Table Text Block] znog_ClassOfWarrantOrRightExercisedInPeriod Class of Warrant or Right, Exercised in Period (in shares) Represents the number of warrants exercised during the period. Share-Based Payment Arrangement, Option [Member] Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] znog_SubscriptionsReceivableFromShareholdersOrAffiliatesForIssuanceOfCapitalStock Subscriptions Receivable from Shareholders or Affiliates for Issuance of Capital Stock Amount due from owner or affiliate of reporting entity for issuance of shares classified as subscriptions receivable. Current liabilities znog_ChangesInInsuranceFinancing Changes in insurance premium financing The amount of changes in the insurance premium financing. znog_ClassOfWarrantOrRightIssuedInPeriod Class Of Warrant Or Right, Issued In Period (in shares) The number of warrants or right issued during the period. us-gaap_LiabilitiesCurrent Total current liabilities ZNWBB Warrants [Member] Represents the ZNWBB warrants. Supplier Concentration Risk [Member] Lease, Cost [Table Text Block] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod Expired/Cancelled/Forfeited (in shares) znog_WarrantsExercised Warrants Exercised (in shares) The number of warrants that were exercised. Other Commitments [Table] Accumulated depreciation, property plant and equipment Balance Balance Value of options granted to employees, directors and others as non-cash compensation Expired/Cancelled/Forfeited, weighted average exercise price (in dollars per share) General and administrative Total General and administrative expenses us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Loss, before income taxes Additional paid-in capital us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment Payments to Acquire Oil and Gas Property and Equipment Use of Estimates, Policy [Policy Text Block] Prepaid expenses and other (see Note 2H) us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Acquisition of property and equipment Lessee, Operating Leases [Text Block] Weighted average contractual life (Year) Current assets Funds received from option exercises us-gaap_AssetsCurrent Total current assets Funds received from option exercises (in shares) Exercised (in shares) Depreciation Depreciation Related and Nonrelated Parties [Axis] us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) znog_EquityAgreementSharePriceThreshold Equity Agreement, Share Price Threshold (in dollars per share) Represents the share price threshold for an equity agreement. znog_EquityAgreementAmountAuthorized Equity Agreement, Amount Authorized Represents the amount of equity authorized to be issued as part of an agreement. Waiver Term Sheet Warrants [Member] Relating to the waiver term sheet warrants. Waiver Term Sheet Agreement [Member] Relating to the waiver term sheet agreement. Cash flows from operating activities Cash flows from investing activities Unproved oil and gas properties, full cost method (see Note 4) Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash used in operating activities Cash flows from financing activities us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities Share-Based Payment Arrangement, Activity [Table Text Block] Accounting Policies [Abstract] Segments [Domain] Segments [Axis] Other assets Income Statement [Abstract] Warrant, expiration date us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Net loss Net Income (Loss) Attributable to Parent Net loss Proceeds from issuance of stock and exercise of warrants Represents the cash in flow from issuance of common stock and warrant exercises. us-gaap_AreaOfRealEstateProperty Area of Real Estate Property (Square Foot) Other costs Represents the other capitalized costs excluded from amortization from oil and gas as part of the full cost method. Funds received from sale of DSPP units and shares and exercise of warrants Represents the amount of stock issued from dividend reinvestment plan and warrant exercises. us-gaap_AreaOfLand Area of Land (Acre) Funds received from sale of DSPP units and shares and exercise of warrants (in shares) Represents the number of shares issued from dividend reinvestment plans and warrants exercised. Vested Options [Member] Relating to vested options. us-gaap_ReceivableFromShareholdersOrAffiliatesForIssuanceOfCapitalStock Stock subscription receivable Accounting Standards Update and Change in Accounting Principle [Table] Asset retirement obligation Related and Nonrelated Parties [Domain] Other receivables Assets held for severance benefits The amount of assets held for severance benefits. Other income (expense), net Statement of Financial Position [Abstract] Provision for severance pay The provision for severance pay. Drilling Rig and Related Equipment [Member] Represents the Drilling rig and related equipment. us-gaap_LiabilitiesNoncurrent Total long-term liabilities us-gaap_NoninterestExpenseDirectorsFees Director's Fees Long-term liabilities Property and Equipment [Member] Represents the property and equipment. us-gaap_OtherAssetsNoncurrent Total other assets us-gaap_OtherCostAndExpenseOperating Other Warrant [Member] us-gaap_WarrantsAndRightsOutstanding Warrants and Rights Outstanding Document Type Document Information [Line Items] Document Quarterly Report us-gaap_ConcentrationRiskPercentage1 Concentration Risk, Percentage us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract (Year) Depreciation of oil and gas equipment The amount of depreciation related to the oil and gas equipment. Unpaid investments in oil & gas properties The unpaid investment in the oil and gas properties. Weighted average remaining lease term (years) (Year) znog_IncreaseDecreaseInGovernmentAssistance Governmental receivables Represents the increase (decrease) in government assistance. Document Information [Table] Severance pay, net The increase (decrease) in severance pay. us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) Antidilutive Securities [Axis] Entity Interactive Data Current us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) Schedule of Stock Options Roll Forward [Table Text Block] Document Transition Report us-gaap_OperatingExpenses Total Other Operating expenses Net loss per share of common stock Oil and Gas Operations [Member] The oil and gas operations. Basic and diluted (in thousands) (in shares) Basic and diluted (in US$) (in dollars per share) Title and Position [Domain] Earnings Per Share, Policy [Policy Text Block] Oil and Gas, Cost Incurred [Policy Text Block] Document Fiscal Period Focus Document Fiscal Year Focus Cash and cash equivalents – restricted Amendment Flag Common Stock [Member] Megiddo Valleys License 434 [Member] Relating to Megiddo Valleys License 434. us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization Spare Parts [Member] Relating to spare parts. Drilling costs, and other operational related costs Oil and Gas Properties [Member] I - 35 Drilling Rig [Member] Relating to the I-35 drilling rig. Capitalized salary costs Legal and seismic costs, license fees and other preparation costs Document Period End Date Long-Lived Asset, Class [Domain] Related Parties [Policy Text Block] The disclosure of the company's policy regarding related parties. Granted to employees, officers, directors and others (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) Legal Entity [Axis] Warrants [Policy Text Block] The disclosure of the company's policy regarding warrants. us-gaap_OperatingLeaseCost Operating Lease, Cost Other Separate Asset [Member] Relating to an other separate asset. Oil and Gas, Acreage [Table] Entity File Number Entity Tax Identification Number Non-cash investing and financing activities: Entity [Domain] Entity Central Index Key Asset Additions Entity Registrant Name znog_InsuranceExpenses Insurance Amount of expenses classified as insurance expense. Single Reportable Segment [Member] Relating to the single reportable segment. Entity Current Reporting Status Capitalized interest costs znog_EmployeeBenefitsExpense Employee Benefits The expense related to employee benefits. znog_AnnualMeetingExpenses Annual meeting The amount of expenses for annual meetings. Entity Incorporation, State or Country Code znog_AccountingFees Accounting Fees Amount of fees related to accounting expenses. Current Fiscal Year End Date Fair Value Measurement, Policy [Policy Text Block] Entity Filer Category Entity Shell Company Entity Emerging Growth Company znog_LegalAndProfessionalFees Legal and professional Fees Amount of legal and professional fees. Entity Small Business us-gaap_OperatingIncomeLoss Loss from operations us-gaap_Revenues Revenues Entity Address, State or Province Entity Address, City or Town Accumulated deficit Retained Earnings (Accumulated Deficit) Entity Address, Address Line One City Area Code Local Phone Number Entity Address, Postal Zip Code Class of Stock [Axis] Entity Common Stock, Shares Outstanding znog_OilAndGasFullCostMethodCapitalizedCostExcludedFromAmortizationNonCashPeriodCost Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization, Non Cash Period Cost Amount of capitalized acquisition, exploration, and development costs and capitalized interest incurred during period and excluded from amortization for oil- and gas-producing activities accounted for under full cost method that is not made in cash. One Senior Officer [Member] Relating to one senior officer. The 2021 Omnibus Incentive Stock Options Plan [Member] Relating to the 2021 Omnibus Incentive Stock Options Plan. znog_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Fair Value The grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Officer [Member] Guarantor Obligations, Nature [Domain] Scenario [Axis] Scenario [Domain] Guarantor Obligations, Nature [Axis] Forecast [Member] us-gaap_ProceedsFromWarrantExercises Proceeds from Warrant Exercises Weighted-average shares outstanding Weighted average exercise price (in dollars per share) Dividend Reinvestment and Stock Purchase Plan (DSPP) [Member] Relating to the dividend reinvestment and stock purchase plan (DSPP) Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) ZNWAM Warrants [Member] Relating to the ZNWAM warrants. Financial income, net Long-Lived Asset, Class [Axis] ZNWAS Warrants [Member] Relating to the ZNWAS warrants. ZNWAU Warrants [Member] Relating to the ZNWAU warrants. ZNWAT Warrants [Member] Relating to the ZNWAT warrants. us-gaap_Assets Total assets ZNWAP Warrants [Member] Relating to the ZNWAP warrants. ZNWAQ Warrants [Member] Relating to the ZNWAQ warrants. Oil and Gas, Present Activity [Table Text Block] Cash and cash equivalents Proceeds From Issuance [Member] Relating to proceeds from issuance. Investor Concentration Risk [Member] Relating to investor concentration risk. Loan due from related party (see Note 2G) Financing Receivable, after Allowance for Credit Loss, Current ZNWBA Warrants [Member] Relating to the ZNWBA warrants. us-gaap_CommonStockCapitalSharesReservedForFutureIssuance Common Stock, Capital Shares Reserved for Future Issuance (in shares) ZNWAA Warrants [Member] Relating to the ZNWAA warrants. Five Senior Officers and Two Staff Members [Member] Relating to five senior officers and two staff members. Asset Class [Domain] znog_LoanReceivableMonthlyPrincipalPayment Loan Receivable, Monthly Principal Payment Represents the monthly principal payment on a loan receivable. Subscription Receivable [Member] Relating to subscription receivable. Stock subscription receivable Represents the cash flow impact of stock subscription. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised Warrants, exercised (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber Warrants, outstanding (in shares) Warrants, outstanding (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted Warrants, issued (in shares) Governmental receivables us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations Warrants, expired (in shares) us-gaap_StockholdersEquity Total stockholders’ equity Balance Balance Stock, Class of Stock [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Other Exercise Price Range 1 [Member] Relating to exercise price range 1. Operating lease assets ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Property, Plant, and Equipment [Table Text Block] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Commitments and contingencies (see Note 6)