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Note 5 - Advances for Vessels Under Construction and Acquisitions (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Feb. 25, 2008 Five LPG Carriers [Member] USD ($) | Feb. 25, 2008 Five LPG Carriers [Member] JPY (¥)
| $ 19,321,045 | $ 22,347,811 | $ 37,273,199 |  |
Contractual Obligation (in Yen) |  |  |  | 124,486,017 | 12,008,000,000
Contractual Obligation |  |  |  | 124,486,017 | 12,008,000,000
Reduction in Contract Price, Percentage | 5.00% |  |  |  |
Advance Payments for Construction | $ 42,432,106 | $ 52,797,646 |  |  |

X
- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Advance payments to ship-builders for vessels under construction or payments to sellers for new vessels. + References No definition available. + Details
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Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | gass_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant