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Deferred Finance Charges - Additional Information (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Debt Issuance Costs, Noncurrent, Net [Abstract] |  |
Debt issuance costs, noncurrent, net, total | $ 0 | $ 941,760

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- Definition Debt issuance costs, noncurrent for nondrawn loan amount. + References No definition available. + Details
Name: | gass_DebtIssuanceCostsNoncurrentForNondrawnLoanAmount
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DeferredFinanceCostsNoncurrentNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration