Represents the number of quarterly installments over which the debt instrument will be paid.

No definition available.

Name:	gass_DebtInstrumentNumberOfQuarterlyInstallments
Namespace Prefix:	gass_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	gass_EBITDAToInterestExpense
Namespace Prefix:	gass_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	gass_Note10LongtermDebtDetailsLineItems
Namespace Prefix:	gass_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Free Cash Flow allowed to be paid as dividends under current loan covenants.

+ References

No definition available.

+ Details

Name:	gass_PercentageOfDividendsPaidToFreeCashFlow
Namespace Prefix:	gass_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Fair Market Value of Vessel Subject to the Minimum Employment Condition

+ References

No definition available.

+ Details

Name:	gass_PercentageOfFairMarketValueOfVesselSubjectToTheMinimumEmploymentCondition
Namespace Prefix:	gass_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Total Debt To Total Maket Value Adjusted Assets

+ References

No definition available.

+ Details

Name:	gass_PercentageOfTotalDebtToTotalMarketValueAdjustedAssets
Namespace Prefix:	gass_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The quarterly commitment fee percentage.

+ References

No definition available.

+ Details

Name:	gass_QuarterlyCommitmentFeePercentage
Namespace Prefix:	gass_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount of term loan borrowings not yet drawn.

+ References

No definition available.

+ Details

Name:	gass_TermLoanAmountNotYetDrawn
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the minimum aggregate cash balance that is required to be maintained under the financial covenants for term loans.

+ References

No definition available.

+ Details

Name:	gass_TermLoanFinancialCovenantsCashRequirement
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Value to Loan Ratio

+ References

No definition available.

+ Details

Name:	gass_ValueToLoanRatio
Namespace Prefix:	gass_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Total current liabilities of the broker-dealer, less certain exceptions as defined.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Rule 15c3-1

-Number 240

-Section 15c3-1

+ Details

Name:	us-gaap_AggregateIndebtedness
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

-URI http://asc.fasb.org/extlink&oid=6504829

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

+ Details

Name:	us-gaap_InterestCostsCapitalized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LoansPayableToBank
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from bank borrowing during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromBankDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=gass_EcoInvictusTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gass_FirstTrancheMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gass_July42014TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gass_July52014TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gass_SecondTrancheMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gass_TermLoanDatedDecember52005Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gass_TermLoanDatedFebruary192009Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gass_TermLoanEnteredIntoOnDecember202013Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gass_TermLoanWithBankMarch242014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherCommitmentsAxis=gass_LPGVesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=gass_LesserOfMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=gass_NotToExceedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=gass_NumeratorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 10 - Long-term Debt (Details) (USD $)	12 Months Ended			0 Months Ended		1 Months Ended	12 Months Ended	1 Months Ended	0 Months Ended		1 Months Ended		0 Months Ended		6 Months Ended	0 Months Ended
Note 10 - Long-term Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 08, 2015	Apr. 25, 2014	Dec. 23, 2013	Dec. 31, 2014	Dec. 20, 2013	Mar. 31, 2014	Jun. 30, 2014	Sep. 30, 2013	Oct. 25, 2013	Oct. 01, 2014	Jul. 04, 2014	Dec. 31, 2014	Jul. 05, 2014	Dec. 19, 2014	Nov. 19, 2014	Apr. 16, 2014	Apr. 14, 2014
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt	$ 81,950,000us-gaap_ProceedsFromIssuanceOfDebt
Repayments of Debt	109,314,769us-gaap_RepaymentsOfDebt
Term Loan Financial Covenants, Cash Requirement	2,500,000						2,500,000								2,500,000
Debt, Weighted Average Interest Rate	2.28%us-gaap_DebtWeightedAverageInterestRate	2.23%us-gaap_DebtWeightedAverageInterestRate	2.39%us-gaap_DebtWeightedAverageInterestRate				2.28%us-gaap_DebtWeightedAverageInterestRate								2.28%us-gaap_DebtWeightedAverageInterestRate
Interest Expense, Debt	8,746,786us-gaap_InterestExpenseDebt	7,997,247us-gaap_InterestExpenseDebt	9,035,248us-gaap_InterestExpenseDebt
Interest Costs Capitalized	2,113,297us-gaap_InterestCostsCapitalized	819,296us-gaap_InterestCostsCapitalized	281,484us-gaap_InterestCostsCapitalized
Long-term Line of Credit	168,225,000us-gaap_LineOfCredit						168,225,000us-gaap_LineOfCredit								168,225,000us-gaap_LineOfCredit
Subsequent Event [Member] \| Eco Corsair and Eco Elysium Term Loan [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt				20,925,000
LPG Vessels [Member] \| Maximum [Member] \| First Facility Agreement with a Bank [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Aggregate Indebtedness																			30,000,000
LPG Vessels [Member] \| Maximum [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Aggregate Indebtedness						22,400,000
LPG Vessels [Member] \| Third of Three Tranches [Member] \| First Facility Agreement with a Bank [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity																			15,750,000
LPG Vessels [Member] \| Two of Three Tranches [Member] \| First Facility Agreement with a Bank [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt					14,250,000
LPG Vessels [Member] \| Second Facility Agreeement with Bank [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Aggregate Indebtedness																				20,400,000
LPG Vessels [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Number of Quarterly Installments						28
Proceeds from Bank Debt							0
Lesser of [Member] \| Condition Met At Delivery [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt								67,200,000
Percentage of Fair Market Value of Vessel Subject to the Minimum Employment Condition								70.00%
Lesser of [Member] \| Condition Not Being Met [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt								62,400,000
Percentage of Fair Market Value of Vessel Subject to the Minimum Employment Condition								65.00%
Maximum [Member] \| Term Loan [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Value to Loan Ratio	130.00%
Maximum [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Quarterly Commitment Fee Percentage	1.10%
Minimum [Member] \| Term Loan [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Value to Loan Ratio	125.00%
Minimum [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.70%
Quarterly Commitment Fee Percentage	0.725%
Not To Exceed [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Percentage of Total Debt To Total Maket Value Adjusted Assets	80.00%
Percentage of Dividends Paid To Free Cash Flow	50.00%
Numerator [Member]
Note 10 - Long-term Debt (Details) [Line Items]
EBITDA to Interest Expense	2.5
Term Loan with Bank, March 24, 2014 [Member] \| First Tranche [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt									17,150,000
Term Loan with Bank, March 24, 2014 [Member] \| Second Tranche [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt										17,150,000
Term Loan with Bank, March 24, 2014 [Member] \| Third of Three Tranches [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Term Loan, Amount Not Yet Drawn	16,250,000						16,250,000								16,250,000
First Tranche [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt											36,762,500
Second Tranche [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt												8,450,000
Term Loan Entered Into on December 20, 2013 [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Loans Payable to Bank	0						0								0
Eco Invictus Term Loan [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Proceeds from Issuance of Debt													13,000,000
July 4, 2014 Term Loan [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Loans Payable to Bank														22,750,000
Debt Instrument, Number of Quarterly Installments														24
Proceeds from Bank Debt															0
July 5, 2014 Term Loan [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Loans Payable to Bank																25,350,000
Debt Instrument, Number of Quarterly Installments																32
Proceeds from Bank Debt															0
Term Loan Dated December 5, 2005 [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Repayments of Debt																	7,005,297	6,780,000
Term Loan Dated February 19, 2009 [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Repayments of Debt																	$ 18,960,000