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Note 5 - Distributions to Holders of Common Units (Details Textual) - $ / shares	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Number of Units That Cash Distributions Were Paid on During the Period (in shares)	34,679,774	34,679,774
Distribution Made to Limited Partner, Distributions Paid, Per Unit (in dollars per share)	$ 0.325612

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