XML 25 R15.htm IDEA: XBRL DOCUMENT v3.21.2

Note 3 - Net Profits Interest Divestiture (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020
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: