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Note 6 - Distributions to Holders of Common Units (Details Textual) - shares	3 Months Ended				6 Months Ended			12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Number of Units That Cash Distributions Were Paid on During the Period (in shares)	38,371,493	37,554,774	36,984,774	34,679,774	37,554,774	35,404,774	34,679,774	35,404,774

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