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Deferred Finance Charges - Additional Information (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Debt Issuance Costs, Noncurrent, Net [Abstract]
Debt issuance costs, noncurrent, net, total	$ 0	$ 941,760

X

- Definition

Debt issuance costs, noncurrent for nondrawn loan amount.

+ References

No definition available.

+ Details

Name:	gass_DebtIssuanceCostsNoncurrentForNondrawnLoanAmount
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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