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Note 5 - Advances for Vessels Under Construction and Acquisitions (Details) - Advances for Vessels Under Construction and Acquisitions (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Advances For Vessels Under Construction And Acquisitions [Abstract]
Balance, December 31	$ 88,965,085gass_AdvancesForVesselsUnderConstructionAndAcquisitions	$ 70,577,435gass_AdvancesForVesselsUnderConstructionAndAcquisitions	$ 19,321,045gass_AdvancesForVesselsUnderConstructionAndAcquisitions
Advances for vessels under construction	124,973,343gass_AdvancesForVesselsUnderConstructionAcquisitions	50,396,200gass_AdvancesForVesselsUnderConstructionAcquisitions
Capitalized interest	2,113,297us-gaap_InterestCostsCapitalized	819,296us-gaap_InterestCostsCapitalized	281,484us-gaap_InterestCostsCapitalized
Capitalized expenses	2,805,342gass_CapitalizedExpenses	40,894gass_CapitalizedExpenses
Vessels delivered	(101,459,533)gass_VesselsDelivered
Vessels cancelled (Note 3)	$ (10,044,799)gass_VesselsCancelled

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_AdvancesForVesselsUnderConstructionAcquisitions
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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

- Details

Name:	gass_AdvancesForVesselsUnderConstructionAndAcquisitionsAbstract
Namespace Prefix:	gass_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Other capitalized costs incurred during the construction period and before a vessel is acquired.

+ References

No definition available.

+ Details

Name:	gass_CapitalizedExpenses
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This item represents the book value including capitalized expenses of vessels that were cancelled by the Company during the period.

+ References

No definition available.

+ Details

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

X

- Definition

This item represents the book value including capitalized expenses of vessels that were delivered to the Company during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

-URI http://asc.fasb.org/extlink&oid=6504829



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration