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Note 4 - Distributions to Holders of Common Units (Details Textual)	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Number of Units That Cash Distributions Were Paid on During the Period (in shares) | shares	34,679,774
Distribution Made to Limited Partner, Distributions Paid, Per Unit (in dollars per share) | $ / shares	$ 0.303441

X

- Definition

Represents number of units that cash distributions were paid on during the period.

+ References

No definition available.

+ Details

Name:	dmlp_NumberOfUnitsThatCashDistributionsWerePaidOnDuringThePeriod
Namespace Prefix:	dmlp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

Name:	us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration