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Note 10 - Customer Deposits (Details Textual) - USD ($)			12 Months Ended
	Oct. 12, 2015	Feb. 24, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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

X

- 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

Name:	us-gaap_ProceedsFromDepositsFromCustomers
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Details

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