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Basis of Presentation and General Information - Vessel Owning Subsidiaries (Details) | 6 Months Ended
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Jun. 30, 2023 m³
Pegasus Shipholding S.A. |
Basis of Presentation and General Information |
Country of incorporation/ formation | Marshall Islands
Cbm Capacity | 149,700
Lance shipping S.A. |
Basis of Presentation and General Information |
Country of incorporation/ formation | Marshall Islands
Cbm Capacity | 149,700
Seacrown Maritime Ltd |
Basis of Presentation and General Information |
Country of incorporation/ formation | Marshall Islands
Cbm Capacity | 149,700
Fareastern Shipping Limited |
Basis of Presentation and General Information |
Country of incorporation/ formation | Malta
Cbm Capacity | 155,000
Navajo Marine Limited |
Basis of Presentation and General Information |
Country of incorporation/ formation | Marshall Islands
Cbm Capacity | 155,000
Solana Holding Ltd. |
Basis of Presentation and General Information |
Country of incorporation/ formation | Marshall Islands
Cbm Capacity | 155,000

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- Definition Description of entity incorporation country name of operation LNG vessels. + References No definition available. + Details
Name: | dlng_EntityIncorporationCountryName
Namespace Prefix: | dlng_
Data Type: | xbrli:normalizedStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of volume of LNG vessels carrier capacity. + References No definition available. + Details
Name: | dlng_LNGCarrierCapacity
Namespace Prefix: | dlng_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

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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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_PegasusShipholdingSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_LanceShippingSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_SeacrownMaritimeLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_FareasternShippingLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_NavajoMarineLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_SolanaHoldingLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |