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Note 10 - Customer Deposits (Details Textual) - USD ($) |  |  | 12 Months Ended
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Oct. 12, 2015 | Feb. 24, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Proceeds from Deposits from Customers |  |  |  | $ 2,556,700 |
Spike [Member] |  |  |  |  |
Proceeds from Deposits from Customers |  | $ 1,820,700 |  |  |
Navig8 Faith [Member] |  |  |  |  |
Proceeds from Deposits from Customers | $ 736,000 |  |  |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
Name: | us-gaap_ProceedsFromDepositsFromCustomers
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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