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Note 2 - Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |
Impairment of Assets, Annual Increase in Undiscounted Cash Flows to Determine Fair Value | 2.00%gass_ImpairmentOfAssetsAnnualIncreaseInUndiscountedCashFlowsToDetermineFairValue |  |
Impairment of Assets, Inflation Rate for Operating Expenses Used to Determine Fair Value | 3.00%gass_ImpairmentOfAssetsInflationRateForOperatingExpensesUsedToDetermineFairValue |  |
Impairment of Long-Lived Assets Held-for-use | $ 6,168,747 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | $ 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | $ 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Disposal Group, Including Discontinued Operation, Assets, Current | $ 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent | $ 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |
Number of Reportable Segments | 1 us-gaap_NumberOfReportableSegments |  |
LPG [Member] |  |  |
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 30 years |  |
Product Carriers [Member] |  |  |
Note 2 - Significant Accounting Policies (Details) [Line Items] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 25 years |  |

X
- Definition With regard to undiscounted cash flows, this element represents the percentage annual increase in historical average rates that is used in determining the estimates (when there is no charter in place) of the fair value of long-term assets for impairment purposes. + References No definition available. + Details
Name: | gass_ImpairmentOfAssetsAnnualIncreaseInUndiscountedCashFlowsToDetermineFairValue
Namespace Prefix: | gass_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition With regard to undiscounted cash flows, this element represents the annual inflation rate percentage for operating expenses that is used in determining the estimates of the fair value of long-term assets for impairment purposes. + References No definition available. + Details
Name: | gass_ImpairmentOfAssetsInflationRateForOperatingExpensesUsedToDetermineFairValue
Namespace Prefix: | gass_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | gass_Note2SignificantAccountingPoliciesDetailsLineItems
Namespace Prefix: | gass_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2473-110228 + Details
Name: | us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51659069&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
Name: | us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51655414&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51661791&loc=d3e1205-110223 + Details
Name: | us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=gass_LPGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=gass_ProductCarriersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |