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Note 5 - Advances for Vessels Under Construction and Acquisitions - Summary of Advances for Vessels Under Construction and Acquisitions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance	$ 55,785,801	$ 44,031,882
Advances for vessels under construction and acquisitions	57,805,820	51,949,154
Interest Costs Capitalized	813,423	1,660,802	$ 1,822,443
Capitalized expenses	2,475,138	2,576,626
Vessels delivered	(55,302,364)	(44,432,663)
Balance	$ 61,577,818	$ 55,785,801	$ 44,031,882

X

- Definition

Amount of increase in advances for vessels under construction and acquisitions.

+ References

No definition available.

+ Details

Name:	gass_AdvancesDuringPeriod
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

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://fasb.org/us-gaap/role/ref/legacyRef
-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
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration