Note 15 - Voyage Expenses and Vessel Operating Expenses (Details) - Vessels' Operating Expenses (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Vessels' Operating Expenses [Abstract]
Crew wages and related costs	$ 26,378,730us-gaap_LaborAndRelatedExpense	$ 22,138,595us-gaap_LaborAndRelatedExpense	$ 19,304,929us-gaap_LaborAndRelatedExpense
Insurance	2,028,142us-gaap_GeneralInsuranceExpense	1,667,915us-gaap_GeneralInsuranceExpense	1,260,289us-gaap_GeneralInsuranceExpense
Repairs and maintenance	5,194,476gass_RepairsAndMaintenance	4,243,133gass_RepairsAndMaintenance	3,026,513gass_RepairsAndMaintenance
Spares and consumable stores	7,120,974gass_SparesAndConsumableStores	5,757,455gass_SparesAndConsumableStores	5,313,053gass_SparesAndConsumableStores
Miscellaneous expenses	4,713,014us-gaap_OtherCostAndExpenseOperating	2,716,455us-gaap_OtherCostAndExpenseOperating	1,687,193us-gaap_OtherCostAndExpenseOperating
Total	$ 45,435,336us-gaap_OperatingCostsAndExpenses	$ 36,523,553us-gaap_OperatingCostsAndExpenses	$ 30,591,977us-gaap_OperatingCostsAndExpenses

Cost of repairs and maintenance during the period.

No definition available.

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

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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

- Definition

The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

+ References

+ Details

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

- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

+ References

No definition available.

+ Details

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

- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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