Document And Entity Information Statistical Measurement [Axis] Note To Financial Statement Details Textual Note 2 - Summary of Significant Accounting Policies Note 7 - Leases ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 2 - Summary of Significant Accounting Policies - Schedule of Partnership's Receivables (Details) ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 2 - Summary of Significant Accounting Policies - Disaggregation of Partnership's Revenue (Details) Trading Arrangements, by Individual [Table] Note 7 - Leases - Maturities of Lease Liabilities (Details) Material Terms of Trading Arrangement [Text Block] Notes To Financial Statements Related and Nonrelated Parties [Axis] Notes To Financial Statements [Abstract] Minimum [Member] Statistical Measurement [Domain] Maximum [Member] Litigation Case [Domain] us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Accounts payable and other current liabilities us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities Cash flows from operating activities: Litigation Affecting Certain Leasehold in Midland County, Texas [Member] Represents litigation affecting certain leasehold in Midland County, Texas. Cash flows provided by investing activities: us-gaap_OilAndGasPropertyFullCostMethodDepletion Accumulated full cost depletion us-gaap_OilAndGasPropertyFullCostMethodNet Oil and Gas, Full Cost Method, Property and Equipment, after Accumulated Depletion Total us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Cash flows used in financing activities: Business Description and Basis of Presentation [Text Block] Oil and natural gas properties (full cost method) Counterparty Name [Axis] us-gaap_ReceivablesNetCurrent Total Receivables Accounting Policies [Abstract] Royalties [Member] Related to royalties. Other Revenue [Member] Related to other revenue. us-gaap_LesseeOperatingLeaseDiscountRate Lessee, Operating Lease, Discount Rate Distributions, per unit (in dollars per share) Litigation Case [Axis] Leasehold Improvements [Member] Counterparty Name [Domain] Income Statement [Abstract] us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid Distributions paid to General Partner and unitholders us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit Distribution Made to Limited Partner, Distributions Paid, Per Unit (in dollars per share) Segment Reporting [Text Block] Net income Net income Adjustments to reconcile net income to net cash provided by operating activities: us-gaap_Liabilities Total liabilities us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and partnership capital Costs and expenses us-gaap_AreaOfRealEstateProperty Area of Real Estate Property (Acre) Segment Reporting [Table] Prepaid expenses and other current assets us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Distributions Made to Limited Partner [Table] Subsequent Event [Member] us-gaap_CostsAndExpenses Total costs and expenses Lessee, Lease, Description [Table] Changes in operating assets and liabilities: Accounting Standards Update and Change in Accounting Principle [Table] Net Profit Interests [Member] Information pertaining to net profit interests. Lease Bonus [Member] Information pertaining to lease bonus. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Increase (decrease) in cash and cash equivalents Related and Nonrelated Parties [Domain] Common units (in shares) us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Statement [Table] us-gaap_IncreaseDecreaseInDueFromRelatedParties Net profits interest receivable - related party us-gaap_LimitedPartnersCapitalAccount Unitholders (48,256 common units issued and outstanding as of June 30, 2026 and December 31, 2025, respectively) dmlp_OperatingLeasesMonthlyPayments Operating Leases, Monthly Payments Represents monthly operating leases payments. Statement of Financial Position [Abstract] 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. Product and Service [Domain] Product and Service [Axis] us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total lease payments Document Type Document Information [Line Items] Document Quarterly Report us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract (Month) 2027 Document Information [Table] us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 2026 Entity Interactive Data Current Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] 2029 Document Transition Report Commitments and Contingencies Disclosure [Text Block] 2028 Statement [Line Items] 2030 Weighted average basic and diluted common units outstanding (in shares) Net income per common unit (basic and diluted) (in dollars per share) Title and Position [Domain] Accounts payable and other current liabilities us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Multiple Unrelated Third Party [Member] Represents multiple unrelated party. us-gaap_TableTextBlock Notes Tables Document Fiscal Period Focus Document Fiscal Year Focus Amendment Flag Document Period End Date General Partner [Member] Limited Partner [Member] Mineral and Royalty Interest in New Mexico and Texas [Member] Related to interest. Nonrelated Party [Member] Long-Lived Asset, Class [Domain] Legal Entity [Axis] Related Party [Member] Significant Accounting Policies [Text Block] Amortization of operating lease right-of-use asset us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less amount representing interest Entity File Number Operating lease liability us-gaap_OperatingLeaseLiabilityNoncurrent Entity Tax Identification Number Total lease obligation Operating lease liability Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key Entity Registrant Name Entity Current Reporting Status Entity Incorporation, State or Country Code Current Fiscal Year End Date Entity Filer Category Entity Shell Company Entity Emerging Growth Company Entity Small Business Operating revenues Entity Address, State or Province Loss Contingencies [Table] Entity Address, City or Town Statement of Partners' Capital [Abstract] Entity Address, Address Line One Statement of Cash Flows [Abstract] City Area Code Local Phone Number Entity Address, Postal Zip Code us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] 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. Title of 12(b) Security Equity Components [Axis] Security Exchange Name Trading Symbol Operating lease liability us-gaap_IncreaseDecreaseInOperatingLeaseLiability Increase (Decrease) in Operating Lease Liability Class of Stock [Axis] Equity Component [Domain] Entity Common Stock, Shares Outstanding Chief Executive Officer [Member] Asset Acquisition [Domain] Asset Acquisition [Table] Asset Acquisition [Axis] us-gaap_PropertyPlantAndEquipmentNet Total Leasehold improvements us-gaap_AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable Subsequent Event Type [Domain] Subsequent Event Type [Axis] General Partner Unitholders Other Receivables [Member] Relating to other recievables. Receivable [Domain] Long-Lived Asset, Class [Axis] us-gaap_Assets Total assets Cash and cash equivalents Current liabilities: us-gaap_LiabilitiesCurrent Total current liabilities Thereafter Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Mineral and Royalty Interest in Adams County, Colorado [Member] Related to interest. dmlp_LesseeOperatingLeaseTermOfContractExtension Lessee, Operating Lease, Term of Contract, Extension (Month) Period of extension on the term of contract of operating lease of the lessee. dmlp_IncreaseDecreaseInOperatingLeaseRightofuseAsset Increase (Decrease) in Operating Lease Right-of-use Asset Amount of increase (decrease) in right-of-use asset for operating lease. Mineral and Royalty Interests in Williston Basin in North Dakota [Member] Represents mineral and royalty interests in Williston Basin in North Dakota. Accounts receivable Accounts receivable Depreciation, depletion and amortization Depreciation, depletion and amortization Allocation of net income us-gaap_ProceedsFromLegalSettlements Proceeds from Legal Settlements Accounts and Financing Receivables [Table] Trade Accounts Receivable [Member] Partner Type [Axis] us-gaap_PartnersCapital Total partnership capital Balance Balance Receivable Type [Axis] Partnership capital: dmlp_NumberOfCountiesInWhichEntityOperates Number Of Counties In Which Entity Operates The number of counties the entity operates in. us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Accumulated amortization us-gaap_PartnersCapitalAccountDistributions Distributions Schedule of Partneship's Receivables [Table Text Block] Tabular disclosure of schedule of partneship's receivables. Partner Type of Partners' Capital Account, Name [Domain] General and administrative expenses us-gaap_PartnersCapitalAccountUnits Balance (in shares) Balance (in shares) us-gaap_NumberOfStatesInWhichEntityOperates Number of States in which Entity Operates Partners' Capital Notes Disclosure [Text Block] Prepaid expenses and other current assets Operating, including production taxes Royalties, Natural Gas [Member] Related to royalties in natural gas sales. 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. Lessee, Operating Leases [Text Block] Royalties, Oil [Member] Related to royalties in oil sales. Nature of Operation, Product Information, Concentration of Risk [Table] Current assets: Operating lease right-of-use asset us-gaap_GeneralPartnersCapitalAccount General Partner us-gaap_AssetsCurrent Total current assets ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Revenue us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax Operating revenues Commitments and contingencies (Note 4)