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Note 11 - Derivatives and Fair Value Disclosures (Details) | 12 Months Ended |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2014 JPY (¥) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Designated as Hedging Instrument [Member] | Oct. 01, 2009 Designated as Hedging Instrument [Member] | Dec. 31, 2014 Minimum [Member] | Dec. 31, 2014 Maximum [Member] | Apr. 10, 2014 Interest Rate Swap [Member] USD ($)
Note 11 - Derivatives and Fair Value Disclosures (Details) [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | $ 48,692,694 invest_DerivativeNotionalAmount |  | $ 53,682,179 invest_DerivativeNotionalAmount |  |  |  |  |  | $ 17,553,663 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Interest Rate Swap, Fixed Rate |  |  |  |  |  |  | 2.60%gass_InterestRateSwapFixedRate / us-gaap_RangeAxis = us-gaap_MinimumMember | 4.73%gass_InterestRateSwapFixedRate / us-gaap_RangeAxis = us-gaap_MaximumMember |
Derivative, Reference Rate LIBOR | 0.33%gass_DerivativeReferenceRateLIBOR | 0.33%gass_DerivativeReferenceRateLIBOR |  |  |  |  |  |  |
Derivative, Number of Instruments Held |  |  |  |  | 1 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 5 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  |  | 2.60%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Foreign Currency Forward Contracts Converted, Amount |  | 900,000,000 gass_ForeignCurrencyForwardContractsConvertedAmount | 0 gass_ForeignCurrencyForwardContractsConvertedAmount | 0 gass_ForeignCurrencyForwardContractsConvertedAmount |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Reclassification from OCI | (49,471)gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI |  | 67,849 gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI | 54,340 gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI |  |  |  |  |
Impaired Long-lived Assets, Pre-impairment Carrying Value | 8,145,798 gass_ImpairedLongLivedAssetsPreImpairmentCarryingValue |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 6,168,747 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | 1,977,051 us-gaap_AssetsFairValueDisclosureNonrecurring |  | 0 us-gaap_AssetsFairValueDisclosureNonrecurring |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Nonrecurring |  |  | $ 0 us-gaap_LiabilitiesFairValueDisclosureNonrecurring |  |  |  |  |  |

X
- Definition Represents the gains or losses transferred from accumulated other comprehensive income (loss) to the statement of income during the period. + References No definition available. + Details
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- Definition No authoritative reference available. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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