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Note 5 - Advances for Vessels Under Construction and Acquisitions (Detail) - Advances for Vessels Under Construction and Acquisitions (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Balance, December 31 | $ 22,347,811 | $ 37,273,199 |
Advances for vessels under construction | 61,632,129 | 52,797,646 |
Capitalized interest | 281,484 | 557,565 | 556,314
Capitalized expenses | 721,220 | 1,625,979 |
Vessels delivered | (65,661,599) | (69,906,578) |
Balance, December 31 | $ 19,321,045 | $ 22,347,811 | $ 37,273,199

X
- Definition Advance payments to ship-builders for vessels under construction or payments to sellers for new vessels. + References No definition available. + Details
Name: | gass_AdvancesForVesselsUnderConstructionAcquisitions
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Advance payments to ship-builders for vessels under construction or payments to sellers for new vessels. + References No definition available. + Details
Name: | gass_AdvancesForVesselsUnderConstructionAndAcquisitions
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other capitalized costs incurred during the construction period and before a vessel is acquired. + References No definition available. + Details
Name: | gass_CapitalizedExpenses
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This item represents the book value including capitalized expenses of vessels that were delivered to the Company during the period. + References No definition available. + Details
Name: | gass_VesselsDelivered
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest capitalized during the period. + References Reference 1: 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 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_InterestCostsCapitalized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration