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Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure
Tonnage taxes for the period	$ 332	$ 548	$ 417
Potential income tax in absence of exemption	$ 29	$ 0	$ 123

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration