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Note 4 - Related Party Transactions (Details Textual) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
General and Administrative Reimbursement, Maximum Percentage | 5.00% | 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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration