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Earnings per share - Additional Information (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Earnings Per Share [Line Items] |  |  |
Incremental common shares attributable to unexercised options to acquire common shares | 96,101 | 70,502 | 113

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- Definition Earnings per share . + References No definition available. + Details
Name: | gass_EarningsPerShareLineItems
Namespace Prefix: | gass_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Incremental common shares attributable to unexercised options to acquire common shares. + References No definition available. + Details
Name: | gass_IncrementalCommonSharesAttributableToUnexercisedOptionsToAcquireCommonShares
Namespace Prefix: | gass_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration