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Note 5 - Advances for Vessels Under Construction and Acquisitions (Details) - Advances for Vessels Under Construction and Acquisitions (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Advances For Vessels Under Construction And Acquisitions [Abstract] |  |  |
Balance, December 31 | $ 88,965,085 gass_AdvancesForVesselsUnderConstructionAndAcquisitions | $ 70,577,435 gass_AdvancesForVesselsUnderConstructionAndAcquisitions | $ 19,321,045 gass_AdvancesForVesselsUnderConstructionAndAcquisitions
Advances for vessels under construction | 124,973,343 gass_AdvancesForVesselsUnderConstructionAcquisitions | 50,396,200 gass_AdvancesForVesselsUnderConstructionAcquisitions |
Capitalized interest | 2,113,297 us-gaap_InterestCostsCapitalized | 819,296 us-gaap_InterestCostsCapitalized | 281,484 us-gaap_InterestCostsCapitalized
Capitalized expenses | 2,805,342 gass_CapitalizedExpenses | 40,894 gass_CapitalizedExpenses |
Vessels delivered | (101,459,533)gass_VesselsDelivered |  |
Vessels cancelled (Note 3) | $ (10,044,799)gass_VesselsCancelled |  |

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: | na
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
- Details
Name: | gass_AdvancesForVesselsUnderConstructionAndAcquisitionsAbstract
Namespace Prefix: | gass_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 cancelled by the Company during the period. + References No definition available. + Details
Name: | gass_VesselsCancelled
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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: | credit
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 -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