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Note 3 - Net Profits Interests Divestiture (Details Textual) $ in Millions	Sep. 30, 2020 USD ($)
Net Profits Interests Divestiture, Consideration	$ 5.7
Trade and Other Receivables [Member]
Net Profits Interests Divestiture, Consideration, Holdbacks	0.2
General and Administrative Expense [Member]
Net Profits Interests Divestiture Transaction Costs	$ 0.5

X

- Definition

Amount of consideration received or receivable for net profits interest divestiture.

+ References

No definition available.

+ Details

Name:	dmlp_NetProfitsInterestsDivestitureConsideration
Namespace Prefix:	dmlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The portion of the consideration that is not paid at the closing date.

+ References

No definition available.

+ Details

Name:	dmlp_NetProfitsInterestsDivestitureConsiderationHoldbacks
Namespace Prefix:	dmlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of transaction costs related to the net profits interests divestiture.

+ References

No definition available.

+ Details

Name:	dmlp_NetProfitsInterestsDivestitureTransactionCosts
Namespace Prefix:	dmlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=dmlp_TradeAndOtherReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: