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Note 5 - Advances for Vessels Under Construction and Acquisitions (Detail)	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Feb. 25, 2008 Five LPG Carriers [Member] USD ($)	Feb. 25, 2008 Five LPG Carriers [Member] JPY (¥)
	$ 19,321,045	$ 22,347,811	$ 37,273,199
Contractual Obligation (in Yen)				124,486,017	12,008,000,000
Contractual Obligation				124,486,017	12,008,000,000
Reduction in Contract Price, Percentage	5.00%
Advance Payments for Construction	$ 42,432,106	$ 52,797,646

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	gass_AdvancePaymentsForConstruction
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Advance payments to ship-builders for vessels under construction or payments to sellers for new vessels.

+ References

No definition available.

+ Details

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

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	gass_ReductionInContractPricePercentage
Namespace Prefix:	gass_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant