Document And Entity Information Note To Financial Statement Details Textual Document Fiscal Period Focus Significant Accounting Policies Document Fiscal Year Focus Note 2 - Summary of Significant Accounting Policies 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) Amendment Flag Trading Arrangements, by Individual [Table] Notes To Financial Statements Material Terms of Trading Arrangement [Text Block] Notes To Financial Statements [Abstract] Related and Nonrelated Parties [Axis] 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] Litigation Case [Domain] Legal Entity [Axis] us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Related Party [Member] Significant Accounting Policies [Text Block] Accounts payable and other current liabilities us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities Cash flows from operating activities: Amortization of operating lease right-of-use asset Entity File Number Operating lease liability us-gaap_OperatingLeaseLiabilityNoncurrent Entity Tax Identification Number 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 Operating lease liability Disaggregation of Revenue [Table Text Block] Cash flows used in financing activities: Business Description and Basis of Presentation [Text Block] Oil and natural gas properties (full cost method) Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key Entity Registrant Name Entity Current Reporting Status Entity Incorporation, State or Country Code Counterparty Name [Axis] Current Fiscal Year End Date Entity Filer Category Entity Shell Company Entity Emerging Growth Company Entity Small Business us-gaap_ReceivablesNetCurrent Total Receivables Operating revenues Accounting Policies [Abstract] Royalties [Member] Related to royalties. Other Revenue [Member] Related to other revenue. Accounts Receivable [Policy Text Block] Distributions, per unit (in dollars per share) Entity Address, State or Province Statement of Stockholders' Equity [Abstract] Loss Contingencies [Table] Litigation Case [Axis] Entity Address, City or Town Leasehold Improvements [Member] Counterparty Name [Domain] Income Statement [Abstract] Entity Address, Address Line One Statement of Cash Flows [Abstract] City Area Code Local Phone Number us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid Distributions paid to General Partner and unitholders Entity Address, Postal Zip Code us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] us-gaap_NumberOfReportableSegments Number of Reportable Segments us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit Distribution Made to Limited Partner, Distributions Paid, Per Unit (in dollars per share) 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 Segment Reporting [Text Block] Equity Components [Axis] Security Exchange Name Trading Symbol Operating lease liability us-gaap_IncreaseDecreaseInOperatingLeaseLiability Class of Stock [Axis] Net income Net income Adjustments to reconcile net income to net cash provided by operating activities: Equity Component [Domain] us-gaap_Liabilities Total liabilities Revenue [Policy Text Block] Entity Common Stock, Shares Outstanding us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and partnership capital Costs and expenses us-gaap_AreaOfRealEstateProperty Area of Real Estate Property (Acre) Chief Executive Officer [Member] Asset Acquisition [Domain] Asset Acquisition [Table] Segment Reporting [Table] Asset Acquisition [Axis] Prepaid expenses and other current assets us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Distributions Made to Limited Partner [Table] us-gaap_PropertyPlantAndEquipmentNet Total Leasehold improvements Subsequent Event [Member] us-gaap_AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable us-gaap_CostsAndExpenses Total costs and expenses Subsequent Event Type [Domain] Subsequent Event Type [Axis] Changes in operating assets and liabilities: Accounting Standards Update and Change in Accounting Principle [Table] General Partner Unitholders dmlp_PolicyTable Net Profit Interests [Member] Information pertaining to net profit interests. Lease Bonus [Member] Information pertaining to lease bonus. Other Receivables [Member] Relating to other recievables. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Decrease in cash and cash equivalents Related and Nonrelated Parties [Domain] Common units (in shares) Receivable [Domain] Long-Lived Asset, Class [Axis] us-gaap_Assets Total assets New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash and cash equivalents Statement [Table] us-gaap_IncreaseDecreaseInDueFromRelatedParties Net profits interest receivable - related party us-gaap_LimitedPartnersCapitalAccount Unitholders (48,256 common units issued and outstanding as of March 31, 2026 and December 31, 2025, respectively) Current liabilities: us-gaap_LiabilitiesCurrent Total current liabilities Mineral and Royalty Interest in Adams County, Colorado [Member] Related to interest. Statement of Financial Position [Abstract] Accounts receivable Accounts receivable Depreciation, depletion and amortization Depreciation, depletion and amortization Allocation of 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_ProceedsFromLegalSettlements Proceeds from Legal Settlements Accounts and Financing Receivables [Table] Trade Accounts Receivable [Member] Product and Service [Domain] Partner Type [Axis] Product and Service [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 Document Type Document Information [Line Items] Document Quarterly Report Document Information [Table] Schedule of Partneship's Receivables [Table Text Block] Tabular disclosure of schedule of partneship's receivables. Partner Type of Partners' Capital Account, Name [Domain] us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) General and administrative Entity Interactive Data Current us-gaap_PartnersCapitalAccountUnits Balance (in shares) Balance (in shares) Document Transition Report Commitments and Contingencies Disclosure [Text Block] Statement [Line Items] us-gaap_NumberOfStatesInWhichEntityOperates Number of States in which Entity Operates Partners' Capital Notes Disclosure [Text Block] Weighted average basic and diluted common units outstanding (in shares) Use of Estimates, Policy [Policy Text Block] Prepaid expenses and other current assets Operating, including production taxes Net income per common unit (basic and diluted) (in dollars per share) 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. Royalties, Oil [Member] Related to royalties in oil sales. Nature of Operation, Product Information, Concentration of Risk [Table] Title and Position [Domain] Current assets: Operating lease right-of-use asset us-gaap_GeneralPartnersCapitalAccount General Partner us-gaap_AssetsCurrent Total current assets Accounts payable and other current liabilities ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Revenue us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax Operating revenues us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Multiple Unrelated Third Party [Member] Represents multiple unrelated party. Commitments and contingencies (Note 4) us-gaap_TableTextBlock Notes Tables