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Note 6 - Distributions to Holders of Common Units (Details Textual) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of Units That Cash Distributions Were Paid on During the Period (in shares)	34,679,774	34,679,774

X

- Definition

Represents number of units that cash distributions were paid on during the period.

+ References

No definition available.

+ Details

Name:	dmlp_NumberOfUnitsThatCashDistributionsWerePaidOnDuringThePeriod
Namespace Prefix:	dmlp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration