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Note 3 - Net Profits Interest Divestiture (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($)
Net Profits Interests Divestiture, Consideration | $ 5.7
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 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_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |