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Note 2 - Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 2 - Significant Accounting Policies (Details) [Line Items]      
Impairment of Assets, Annual Increase in Undiscounted Cash Flows to Determine Fair Value 2.00%gass_ImpairmentOfAssetsAnnualIncreaseInUndiscountedCashFlowsToDetermineFairValue    
Impairment of Assets, Inflation Rate for Operating Expenses Used to Determine Fair Value 3.00%gass_ImpairmentOfAssetsInflationRateForOperatingExpensesUsedToDetermineFairValue    
Impairment of Long-Lived Assets Held-for-use $ 6,168,747us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Disposal Group, Including Discontinued Operation, Assets, Current $ 0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent $ 0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent  
Number of Reportable Segments 1us-gaap_NumberOfReportableSegments    
LPG [Member]      
Note 2 - Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 30 years    
Product Carriers [Member]      
Note 2 - Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 25 years