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Note 11 - Derivatives and Fair Value Disclosures (Details) - Effect of Derivative Instruments on the Statements of Income (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Rate Swap — Reclassification from OCI | $ (49,471)gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI | $ 67,849 gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI | $ 54,340 gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI
Total loss on derivatives | (1,348,384)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | (27,470)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | (1,086,258)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Other Comprehensive Income (Loss) [Member] | Interest Rate Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Rate Swap — Reclassification from OCI | (49,471)gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | 67,849 gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | 54,340 gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsReclassificationFromOCI / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember
Interest Rate Swap — Change in Fair Value | 1,652,692 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGain / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | 2,716,274 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGain / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | 3,452,556 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGain / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember
Interest Rate Swap — Realized loss | (1,857,362)gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealizedLoss / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | (2,811,593)gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealizedLoss / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | (4,593,154)gass_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealizedLoss / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember
Other Comprehensive Income (Loss) [Member] | Foreign Exchange Future [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Foreign Currency Contract — Change in Fair Value | (583,368)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLoss / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeFutureMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  |
Foreign Currency Contract — Realized loss | $ (510,875)gass_ForeignCurrencyContractRealizedGainLoss / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeFutureMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  |

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- Definition Represents the realized loss on derivative instruments not designated as hedging instruments. + References No definition available. + Details
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- 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 Represents the realized gain (loss) on foreign currency contract(s). + References No definition available. + Details
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- Definition Amount of realized and unrealized gain of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Amount of realized and unrealized loss of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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