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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Advances For Vessels Under Construction And Acquisitions [Abstract] |  |  |
Balance, December 31 | $ 88,965,085 | $ 70,577,435 |
Advances for vessels under construction | 148,318,231 | 124,973,343 |
Capitalized interest | 1,822,443 | 2,113,297 | $ 819,296
Capitalized expenses | 5,085,534 | 2,805,342 |
Vessels delivered | (200,159,411) | (101,459,533) |
Vessels cancelled (Note 3) |  | (10,044,799) |
Balance, December 31 | $ 44,031,882 | $ 88,965,085 | $ 70,577,435

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- 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
- References No definition available. + 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