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Note 6 - Distributions to Holders of Common Units (Details Textual) - shares | 3 Months Ended | 6 Months Ended | 12 Months Ended
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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