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Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure |  |  |
Tonnage taxes for the period | $ 417 | $ 339 | $ 270
Potential income tax in absence of exemption | $ 123 | $ 51 | $ 42

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- Definition Potential income tax in absence of exemption. + References No definition available. + Details
Name: | dlng_PotentialIncomeTaxInAbsenceOfExemption
Namespace Prefix: | dlng_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition The tonnage taxes for the period. + References No definition available. + Details
Name: | dlng_TonnageTax
Namespace Prefix: | dlng_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration