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Basis of Presentation and General Information - Non-Vessel Owning Subsidiaries (Details) | 6 Months Ended
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Jun. 30, 2023
Dynagas Operating LP |
Basis of Presentation and General Information |
Ownership interest in subsidiary | 100.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_OwnershipAxis=dlng_DynagasOperatingLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |