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Note 17 - Voyage Expenses and Vessel Operating Expenses - Voyage Expenses (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Port expenses	$ 2,546,926	$ 3,306,157	$ 3,960,574
Bunkers	6,668,126	6,117,326	8,566,490
Commissions	4,584,612	4,259,812	4,112,177
Other voyage expenses	1,916,873	1,706,970	936,297
Total	$ 15,716,537	$ 15,390,265	$ 17,575,538

X

- Definition

Amount of expense recognized during the period for bunkers.

+ References

No definition available.

+ Details

Name:	gass_BunkerExpense
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expense recognized during the period for commissions.

+ References

No definition available.

+ Details

Name:	gass_CommissionsExpense
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expense recognized during the period for other voyage expenses.

+ References

No definition available.

+ Details

Name:	gass_OtherVoyageExpense
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expense recognized during the period for port expenses.

+ References

No definition available.

+ Details

Name:	gass_PortExpenses
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The total amount of voyage expenses, including related parties, recognized during the period.

+ References

No definition available.

+ Details

Name:	gass_VoyageExpensesIncludingRelatedParty
Namespace Prefix:	gass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration