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Document and Entity Information
 12 Months Ended
Dec. 31, 2011
Document and Entity Information [Line Items]  
Document Type 20-F
Document Period End Date Dec. 31, 2011
Amendment Flag false
Entity Registrant Name StealthGas Inc.
Entity Central Index Key 0001328919
Entity Current Reporting Status Yes
Entity Voluntary Filers No
Current Fiscal Year End Date --12-31
Entity Filer Category Accelerated Filer
Entity Well Known Seasoned Issuer No
Document Fiscal Year Focus 2011
Document Fiscal Period Focus FY
Entity common stock shares outstanding 20,552,568