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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, 2015	Dec. 31, 2014	Dec. 31, 2013
Advances For Vessels Under Construction And Acquisitions [Abstract]
Balance, December 31	$ 88,965,085	$ 70,577,435
Advances for vessels under construction	148,318,231	124,973,343
Capitalized interest	1,822,443	2,113,297	$ 819,296
Capitalized expenses	5,085,534	2,805,342
Vessels delivered	(200,159,411)	(101,459,533)
Vessels cancelled (Note 3)		(10,044,799)
Balance, December 31	$ 44,031,882	$ 88,965,085	$ 70,577,435

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

- References

No definition available.

+ 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

Name:	us-gaap_InterestCostsCapitalized
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration