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Note 5 - Advances for Vessels Under Construction and Acquisitions (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Advances for Vessels Under Construction and Acquisitions | $ 61,577,818 | $ 55,785,801 | $ 44,031,882
Other Operating Income (Expense) [Member] |  |  |
Charges for Postponement of Vessel Delivery | $ 1,058,863 |  |
LPG Carriers Contracted in 2014 from Ship-builders [Member] |  |  |
Number of Vessels Under Construction | 3 | 4 |

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
Period Type: | instant

X
- Definition The amount of charges expensed due to the postponemet of vessel deliveries during the period. + References No definition available. + Details
Name: | gass_ChargesForPostponementOfVesselDelivery
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of vessels under construction. + References No definition available. + Details
Name: | gass_NumberOfVesselsUnderConstruction
Namespace Prefix: | gass_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=gass_LPGCarriersContractedIn2014FromShipBuildersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |