XML 67 R34.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Significant Accounting Policies and Recent Accounting Pronouncements (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Provision for doubtful accounts | $ 0 | $ 0
Vessels dry-dock or special survey period within the first 15 years of useful life | 5 years |
Vessels dry-dock or special survey period within the remaining useful life | 2 years 6 months |
Scrap value per light weight ton | $ 685 |
Vessels useful life | 35 years |
Number of Reportable Segments | 1 |

X
- Definition The scrap value of vessels per light weight ton (LWT). + References No definition available. + Details
Name: | dlng_ScrapValuePerLightWeightTon
Namespace Prefix: | dlng_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Vessels dry-dock or special survey period within the first 15 years of useful life. + References No definition available. + Details
Name: | dlng_VesselsDryDockSpecialSurveyPeriodWithinFirstFifteenYearsUsefulLife
Namespace Prefix: | dlng_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Vessels dry-dock or special survey period within the remaining useful life. + References No definition available. + Details
Name: | dlng_VesselsDryDockSpecialSurveyPeriodWithinRemainingUsefulLife
Namespace Prefix: | dlng_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration