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Note 4 - Commitments and Contingencies (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Litigation Affecting Certain Leasehold in Midland County, Texas [Member]
Proceeds from Legal Settlements	$ 15.5

X

- Definition

Cash received for the settlement of litigation during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

+ Details

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

X

- Details

Name:	srt_LitigationCaseAxis=dmlp_LitigationAffectingCertainLeaseholdInMidlandCountyTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: