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Note 4 - Related Party Transactions - Significant Activities Between Partnerships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Profits Interests Payments Receivableor Accrued [Member]
Related Party Transaction, Amounts of Transaction	$ 5,544	$ 8,275	$ 7,170
Net Profits Interests Revenue [Member]
Related Party Transaction, Amounts of Transaction	21,856	34,338	28,207
General and Administrative Amounts (Receivable) Payable[Member]
Related Party Transaction, Amounts of Transaction	(199)	162	68
Total General and Administrative Expenses [Member]
Related Party Transaction, Amounts of Transaction	$ 6,485	$ 5,108	$ 3,399

X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dmlp_NetProfitsInterestsRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dmlp_GeneralAndAdministrativeAmountsReceivablePayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dmlp_TotalGeneralAndAdministrativeExpensesMember
Namespace Prefix:
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