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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

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