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Customer Deposits - Additional Information (Detail) - USD ($) | Mar. 07, 2018 | Oct. 12, 2015 | Feb. 24, 2015 | Dec. 31, 2018
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Spike [Member] |  |  |  |
Deposits [Line Items] |  |  |  |
Proceeds from deposits from customers |  |  | $ 1,820,700 |
Repayment of deposits from customers | $ 1,220,700 |  |  |
Deposits from customers kept as guarantee |  |  |  | $ 600,000
Navig8 Faith [Member] |  |  |  |
Deposits [Line Items] |  |  |  |
Proceeds from deposits from customers |  | $ 736,000 |  |

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- Definition Deposits [Line Items] + References No definition available. + Details
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Namespace Prefix: | gass_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Repayments of customer deposits. + References No definition available. + Details
Name: | gass_RepaymentsOfCustomerDeposits
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash received from customers for deposits on goods or services during the period; excludes deposits with other institutions and time deposits, which pertain to financial services entities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SecurityDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | srt_MajorCustomersAxis=gass_SpikeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=gass_Navig8FaithMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |