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

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- Definition Cost of repairs and maintenance during the period. + References No definition available. + Details
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Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- 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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Balance Type: | debit
Period Type: | duration

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- 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 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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Balance Type: | debit
Period Type: | duration

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- 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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- 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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