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Note 4 - Related Party Transactions (Details Textual)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
General and Administrative Reimbursement, Maximum Percentage	5.00%	5.00%

X

- Definition

The maximum percentage for reimbursement of general and administrative costs.

+ References

No definition available.

+ Details

Name:	dmlp_GeneralAndAdministrativeReimbursementMaximumPercentage
Namespace Prefix:	dmlp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration