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Note 4 - Related Party Transactions - Significant Activities Between Partnerships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net Profits Interests Payments Receivableor Accrued [Member]
Related Party Transaction, Amounts of Transaction	$ 1,914	$ 5,882
Net Profits Interests Revenue [Member]
Related Party Transaction, Amounts of Transaction	8,714	15,753
General and Administrative Amounts (Receivable) Payable[Member]
Related Party Transaction, Amounts of Transaction	486	894
Total General and Administrative Expenses [Member]
Related Party Transaction, Amounts of Transaction	$ 2,905	$ 2,188

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionAmountsOfTransaction
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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