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Basis of Presentation and General Information - Vessel Owning Subsidiaries (Details)	6 Months Ended
	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.

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No definition available.

+ Details

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- Definition

Description of volume of LNG vessels carrier capacity.

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No definition available.

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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.

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No definition available.

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- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_LanceShippingSAMember
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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_SeacrownMaritimeLtdMember
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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_FareasternShippingLimitedMember
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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_NavajoMarineLimitedMember
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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_SolanaHoldingLtdMember
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