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Note 17 - Voyage Expenses and Vessel Operating Expenses - Vessels' Operating Expenses (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Crew wages and related costs | $ 37,345,800 | $ 36,821,527 | $ 31,391,419
Insurance | 2,016,647 | 2,421,948 | 2,415,028
Repairs and maintenance | 6,424,557 | 5,724,148 | 5,091,916
Spares and consumable stores | 8,508,276 | 8,514,293 | 7,978,592
Miscellaneous expenses | 5,124,154 | 5,340,920 | 3,777,670
Total | $ 59,419,434 | $ 58,822,836 | $ 50,654,625

X
- Definition The amount of vessel operating expenses not specifically disclosed elsewhere. + References No definition available. + Details
Name: | gass_OtherVesselOperatingExpenses
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense recognized during the period for repairs and maintenance. + References No definition available. + Details
Name: | gass_RepairsAndMaintenanceExpense
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense recognized during the period for spares and consumable stores. + References No definition available. + Details
Name: | gass_SparesAndConsumableStoresExpense
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of vessel operating expenses, including related parties, recognized during the period. + References No definition available. + Details
Name: | gass_VesselOperatingExpensesIncludingRelatedParty
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_GeneralInsuranceExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_LaborAndRelatedExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration