Document And Entity Information Fair Value of Financial Instruments, Policy [Policy Text Block] Note To Financial Statement Details Textual Significant Accounting Policies 2026 Note 2 - Summary of Significant Accounting Policies 2027 Note 7 - Leases Note 2 - Summary of Significant Accounting Policies - Schedule of Partnership's Receivables (Details) Note 2 - Summary of Significant Accounting Policies - Disaggregation of Partnership's Revenue (Details) Note 7 - Leases - Lease Cost (Details) Note 7 - Leases - Supplemental Cash Flow Information (Details) Note 7 - Leases - Supplemental Balance Sheet Information (Details) Note 7 - Leases - Maturities of Lease Liabilities (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Lessee, Leases [Policy Text Block] us-gaap_LiabilitiesCurrent Total current liabilities us-gaap_LimitedPartnersCapitalAccount Unitholders (48,256 and 47,340 common units issued and outstanding as of December 31, 2025 and 2024, respectively) Earnings Per Share, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Fair value of common units issued for acquisitions of oil and natural gas properties Royalty Revenue [Member] Royalty revenue. Net Profits Interests [Member] Net Profits Interests [Member] Pioneer Natural Resources [Member] us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract (Month) Depreciation, depletion and amortization Depreciation, depletion and amortization us-gaap_OilAndGasPropertyFullCostMethodNet Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion Total dmlp_TexasFranchiseTaxRate Texas Franchise Tax Rate Represents the Texas franchise tax rate. us-gaap_AssetsCurrent Total current assets Partnership capital: Royalties [Member] Related to royalties. Other Revenue [Member] Related to other revenue. Adjustments to reconcile net income to net cash provided by operating activities: Accounts payable and other current liabilities Lessee, Lease, Description [Table] Statistical Measurement [Domain] Operating cash flows from operating leases Maximum [Member] Lessee, Operating Leases [Text Block] Minimum [Member] Product and Service [Axis] Product and Service [Domain] Asset Retirement Obligation [Policy Text Block] us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid Distributions paid to General Partner and unitholders Statistical Measurement [Axis] Exxon Mobil Corporation [Member] In relation to Exxon Mobil Corporation. Diamondback Energy, Inc. [Member] In reference to Diamondback Energy, Inc. us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit Distribution Made to Limited Partner, Distributions Paid, Per Unit (in dollars per share) Distributions, per unit (in dollars per share) us-gaap_PolicyTextBlockAbstract Accounting Policies Distributions Made to Limited Partner [Table] Revenue Operating revenues Operating revenues Non-cash investing and financing activities: Customer [Axis] Customer [Domain] Current liabilities: Net Profit Interests [Member] Information pertaining to net profit interests. Operating lease liability us-gaap_IncreaseDecreaseInOperatingLeaseLiability Lease Bonus [Member] Information pertaining to lease bonus. us-gaap_Assets Total assets us-gaap_ReceivablesNetCurrent Total Receivables Cash flows from operating activities: Schedule of Segment Reporting Information, by Segment [Table] Revenue [Policy Text Block] Statement [Line Items] us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent Accounts Receivable, Allowance for Credit Loss, Current us-gaap_NumberOfOperatingSegments Number of Operating Segments Accounts receivable Accounts receivable us-gaap_NumberOfReportableSegments Number of Reportable Segments Customer Contracts [Member] Partner Type of Partners' Capital Account, Name [Domain] dmlp_OperatingLeasesMonthlyPayments Operating Leases, Monthly Payments Represents monthly operating leases payments. General Partner [Member] Limited Partner [Member] Leasehold Improvements [Member] Property, Plant and Equipment, Policy [Policy Text Block] Long-Lived Tangible Asset [Axis] Segment Reporting Disclosure [Text Block] Long-Lived Tangible Asset [Domain] Partner Type [Axis] Business Description and Basis of Presentation [Text Block] Chief Executive Officer [Member] Current assets: Net income Net income dmlp_AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuableNumberOfShares Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) To represent equity interest issued and issuable under asset acquisition transaction. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect (Decrease) Increase in cash and cash equivalents us-gaap_Liabilities Total liabilities Commitments and contingencies (Note 5) us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Prepaid expenses and other current assets Executive Vice President [Member] Counterparty Name [Axis] Counterparty Name [Domain] Partners' Capital Notes Disclosure [Text Block] Loss Contingencies [Table] Commitments and Contingencies Disclosure [Text Block] us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Accumulated amortization us-gaap_PropertyPlantAndEquipmentNet Total Leasehold improvements Concentration Risk, Credit Risk, Policy [Policy Text Block] us-gaap_PartnersCapitalAccountUnits Balance (in shares) Balance (in shares) Nonrelated Party [Member] us-gaap_PartnersCapital Total partnership capital Balance Balance Oil and natural gas properties (full cost method) us-gaap_OilAndGasPropertyFullCostMethodDepletion Accumulated full cost depletion us-gaap_CostsAndExpenses Total costs and expenses dmlp_PolicyTable Operating revenues: Costs and expenses: Cash flows provided by investing activities: Title and Position [Domain] Multiple Unrelated Third Party [Member] Represents multiple unrelated party. Related Party Transaction [Table] Accounts payable and other current liabilities us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities us-gaap_DeferredRentCredit Deferred Rent Credit Related Party Transactions Disclosure [Text Block] Equity Components [Axis] Equity Component [Domain] Mineral and Royalty Interest in New Mexico and Texas [Member] Related to interest. Mineral and Royalty Interest in Weld County, Colorado [Member] Related to interest. ICFR Auditor Attestation Flag General and administrative expenses Incentive Distribution Policy, Managing Member or General Partner, Description [Policy Text Block] us-gaap_PartnersCapitalAccountDistributions Distributions Production taxes Cash and cash equivalents Royalty [Member] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Document Annual Report Accounts Receivable [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Amendment Flag Entity Incorporation, State or Country Code General and Administrative Expense [Member] Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Document Transition Report City Area Code Document Financial Statement Error Correction [Flag] Use of Estimates, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] Acquisitions of oil and natural gas properties for common units Acquisitions of oil and natural gas properties for common units (in shares) Entity Interactive Data Current Related Party [Member] Security Exchange Name Title of 12(b) Security Acquisition of Producing and Nonproducing Royalty and Mineral Rights [Text Block] The entire disclosure of the acquisition of producing and nonproducing royalty and mineral rights by the reporting entity. Current Fiscal Year End Date Receivable Type [Axis] Receivable [Domain] Prepaid expenses and other current assets us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent Operating lease, weighted average discount rate Document Fiscal Period Focus Operating lease expense Document Fiscal Year Focus Lease, Cost [Table Text Block] Document Period End Date Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Domain] us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1 Operating lease, weighted average remaining lease term (Month) Entity File Number Entity Emerging Growth Company Document Type us-gaap_NumberOfStatesInWhichEntityOperates Number of States in which Entity Operates Entity Small Business Accounts and Financing Receivables [Table] Entity Shell Company Auditor Name Document Information [Line Items] Document Information [Table] us-gaap_AreaOfRealEstateProperty Area of Real Estate Property (Acre) Entity Public Float Unitholders Entity Filer Category Auditor Firm ID Entity Current Reporting Status Entity Voluntary Filers Auditor Location Entity Well-known Seasoned Issuer General Partner us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) us-gaap_ConcentrationRiskPercentage1 Concentration Risk, Percentage us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable us-gaap_ImpairmentOfOilAndGasProperties Impairment, Oil and Gas, Property with Unproved and Proved Reserves Entity Tax Identification Number Entity Central Index Key Insider Trading Policies and Procedures [Line Items] Entity Registrant Name ecd_InsiderTrdPoliciesProcAdoptedFlag Insider Trading Policies and Procedures Adopted [Flag] Entity [Domain] Customer Concentration Risk [Member] Legal Entity [Axis] Statement [Table] Entity Address, Address Line One Statement of Financial Position [Abstract] Other Receivables [Member] Relating to other recievables. Weighted average basic and diluted common units outstanding (in shares) ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] us-gaap_IncreaseDecreaseInDueFromRelatedParties Net profits interest receivable - related party Entity Address, City or Town ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Entity Address, Postal Zip Code Net income per common unit (basic and diluted) (in dollars per share) Entity Address, State or Province ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Concentration Risk Type [Axis] Material Terms of Trading Arrangement [Text Block] Concentration Risk Type [Domain] Statement of Cash Flows [Abstract] Allocation of net income: Entity Common Stock, Shares Outstanding Trading Arrangements, by Individual [Table] Statement of Stockholders' Equity [Abstract] Income Statement [Abstract] Lessee, Operating Lease, Balance Sheet [Table Text Block] The tabular disclosure for balance sheet information of operating leases of the lessee. Revenue Benchmark [Member] Lessee, Operating Lease, Cash Flow [Table Text Block] The tabular disclosure of cash flow information for operating leases of the lessee. Mineral and Royalty Interest in Colorado [Member] Relating to mineral and royalty interest in Colorado. dmlp_RevenueAllocatedToGeneralPartnerPercentage Revenue Allocated To General Partner Percentage The percentage of revenue allocated to the general partner. dmlp_FutureNetRevenuesToProvedOilAndNaturalGasReservesDiscountPercentage Future Net Revenues To Proved Oil And Natural Gas Reserves Discount Percentage The discount percentage for future net revenues to proved oil and natural gas reserves. Trading Symbol Nature of Operation, Product Information, Concentration of Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Mineral and Royalty Interest in Adams County, Colorado [Member] Related to interest. Local Phone Number us-gaap_TableTextBlock Notes Tables Accounting Standards Update and Change in Accounting Principle [Table] Asset Acquisition [Axis] Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] dmlp_GainLossRecognitionUponDispositionOfOilAndGasMinimumPercentOfReserves Gain (Loss) Recognition Upon Disposition of Oil and Gas, Minimum Percent of Reserves Gain or loss recognition upon disposition of oil and gas involving greater than the stated percentage of reserves. dmlp_GeneralAndAdministrativeReimbursementMaximumPercentage General and Administrative Reimbursement, Maximum Percentage The maximum percentage for reimbursement of general and administrative costs. Cash flows used in financing activities: us-gaap_AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Asset Acquisition [Domain] dmlp_NumberOfCountiesInWhichEntityOperates Number Of Counties In Which Entity Operates The number of counties the entity operates in. Operating expenses us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and partnership capital Asset Acquisition [Table] Schedule of Partneship's Receivables [Table Text Block] Tabular disclosure of schedule of partneship's receivables. Chevron Corporation [Member] Represetns Chevron Corporation. Changes in operating assets and liabilities: Amortization of operating lease right-of-use asset Royalties, Natural Gas [Member] Related to royalties in natural gas sales. us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Net cash contributed in acquisitions of oil and natural gas properties Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received To represent royalty and mineral revenue received in asset acquisition transaction. Common units (in shares) Operating lease liability us-gaap_OperatingLeaseLiabilityNoncurrent Class of Stock [Axis] Royalties, Oil [Member] Related to royalties in oil sales. Total lease obligation Operating lease liability Oil and Gas, Accounting Method, Full Cost or Successful Efforts [Policy Text Block] us-gaap_GeneralPartnersCapitalAccount General Partner Operating lease right-of-use asset us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total lease payments us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less amount representing interest 2028 2029