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Consolidated Statements of Income (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues      
Revenues $ 122,158,892us-gaap_SalesRevenueNet $ 111,667,565us-gaap_SalesRevenueNet $ 114,848,079us-gaap_SalesRevenueNet
Revenues – related party 9,814,000us-gaap_RevenueFromRelatedParties 9,814,000us-gaap_RevenueFromRelatedParties 4,364,992us-gaap_RevenueFromRelatedParties
Total revenues 131,972,892us-gaap_Revenues 121,481,565us-gaap_Revenues 119,213,071us-gaap_Revenues
Expenses      
Voyage expenses 12,474,090gass_VoyageExpenses 12,819,866gass_VoyageExpenses 11,231,340gass_VoyageExpenses
Voyage expenses – related party 1,613,421gass_VoyageExpensesRelatedParty 1,482,764gass_VoyageExpensesRelatedParty 1,472,410gass_VoyageExpensesRelatedParty
Charter hire expenses 320,804gass_CharterHireExpenses    
Vessels’ operating expenses 41,335,984gass_VesselsOperatingExpensesExcludingRelatedParty 32,439,404gass_VesselsOperatingExpensesExcludingRelatedParty 28,674,675gass_VesselsOperatingExpensesExcludingRelatedParty
Vessels’ operating expenses – related party 4,099,352gass_VesselsOperatingExpensesRelatedParty 4,084,149gass_VesselsOperatingExpensesRelatedParty 1,917,302gass_VesselsOperatingExpensesRelatedParty
Dry-docking costs 465,681us-gaap_CostOfPropertyRepairsAndMaintenance 3,160,251us-gaap_CostOfPropertyRepairsAndMaintenance 2,067,393us-gaap_CostOfPropertyRepairsAndMaintenance
Management fees – related party 5,501,675us-gaap_ProfessionalAndContractServicesExpense 4,807,010us-gaap_ProfessionalAndContractServicesExpense 4,315,720us-gaap_ProfessionalAndContractServicesExpense
General and administrative expenses (including $1,628,961, $1,323,836, and $1,394,025, to related party) 3,150,929us-gaap_GeneralAndAdministrativeExpense 2,816,397us-gaap_GeneralAndAdministrativeExpense 2,838,759us-gaap_GeneralAndAdministrativeExpense
Depreciation 33,811,607us-gaap_Depreciation 30,761,673us-gaap_Depreciation 28,776,688us-gaap_Depreciation
Impairment loss 6,168,747us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Net gain on sale of vessels     (1,372,409)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Total expenses 108,942,290us-gaap_OperatingExpenses 92,371,514us-gaap_OperatingExpenses 79,921,878us-gaap_OperatingExpenses
Income from operations 23,030,602us-gaap_OperatingIncomeLoss 29,110,051us-gaap_OperatingIncomeLoss 39,291,193us-gaap_OperatingIncomeLoss
Other (expenses)/income      
Interest and finance costs (9,314,539)us-gaap_InterestAndDebtExpense (8,189,475)us-gaap_InterestAndDebtExpense (9,408,230)us-gaap_InterestAndDebtExpense
Loss on derivatives (1,348,384)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet (27,470)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet (1,086,258)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Interest income 456,924us-gaap_InvestmentIncomeInterest 361,820us-gaap_InvestmentIncomeInterest 221,023us-gaap_InvestmentIncomeInterest
Foreign exchange loss (138,777)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (37,733)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (59,241)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other expenses, net (10,344,776)us-gaap_NonoperatingGainsLosses (7,892,858)us-gaap_NonoperatingGainsLosses (10,332,706)us-gaap_NonoperatingGainsLosses
Net income $ 12,685,826us-gaap_NetIncomeLoss $ 21,217,193us-gaap_NetIncomeLoss $ 28,958,487us-gaap_NetIncomeLoss
Earnings per share      
– Basic and diluted (in Dollars per share) $ 0.32us-gaap_EarningsPerShareBasicAndDiluted $ 0.75us-gaap_EarningsPerShareBasicAndDiluted $ 1.41us-gaap_EarningsPerShareBasicAndDiluted
Weighted average number of shares      
– Basic and diluted (in Shares) 39,305,644us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 28,271,746us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 20,552,568us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted