Deferred Charges, Net (Details)	3 Months Ended
Jun. 30, 2021 USD ($)
Movement in deferred charges, net
Balance at the beginning of the period - drydocking costs	$ 10,158,202
Additions - drydocking costs	1,933,613
Transfer to vessel held for sale	(74,561)
Amortization - drydocking costs	(644,764)
Balance at the end of the period - drydocking costs	$ 11,372,490

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Name:	lpg_DeferredCostRollForward
Namespace Prefix:	lpg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Sum of the carrying amounts of drydocking costs that are expected to be recognized as a charge against earnings in periods after one year or beyond the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	lpg_DrydockingCosts
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the drydocking cost additions made during the reporting period in the value of expenditures made during the current reporting period for benefits that will be received over a long-term period.

+ References

No definition available.

+ Details

Name:	lpg_DrydockingCostsAdditions
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the drydocking cost amortization expense recorded during the reporting period in the value of expenditures made during the current reporting period for benefits that will be received over a long-term period.

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No definition available.

+ Details

Name:	lpg_DrydockingCostsAmortization
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the drydocking cost transfer to vessel held for sale made during the reporting period.

+ References

No definition available.

+ Details

Name:	lpg_DrydockingCostsTransferToVesselHeldForSale
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration