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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 $ 48,692,694invest_DerivativeNotionalAmount   $ 53,682,179invest_DerivativeNotionalAmount           $ 17,553,663invest_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         1us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 5us-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   900,000,000gass_ForeignCurrencyForwardContractsConvertedAmount 0gass_ForeignCurrencyForwardContractsConvertedAmount 0gass_ForeignCurrencyForwardContractsConvertedAmount          
Derivative Instruments Not Designated as Hedging Instruments, Reclassification from OCI (49,471)gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI   67,849gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI 54,340gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI          
Impaired Long-lived Assets, Pre-impairment Carrying Value 8,145,798gass_ImpairedLongLivedAssetsPreImpairmentCarryingValue                
Impairment of Long-Lived Assets Held-for-use 6,168,747us-gaap_ImpairmentOfLongLivedAssetsHeldForUse   0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse          
Assets, Fair Value Disclosure, Nonrecurring 1,977,051us-gaap_AssetsFairValueDisclosureNonrecurring   0us-gaap_AssetsFairValueDisclosureNonrecurring            
Liabilities, Fair Value Disclosure, Nonrecurring     $ 0us-gaap_LiabilitiesFairValueDisclosureNonrecurring