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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Trading Symbol GASS
Entity Registrant Name STEALTHGAS INC.
Entity Central Index Key 0001328919
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Accelerated Filer
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 37,858,437
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Document Accounting Standard U.S. GAAP
Entity Address, Address Line One 331 Kifissias Avenue
Entity Address, Address Line Two Erithrea 14561
Entity Address, City or Town Athens
Entity Address, Country GR
Document Annual Report true
Document Transition Report false
Entity File Number 001-36797
Document Shell Company Report false
Document Registration Statement false
Title of 12(b) Security Common Stock
Security Exchange Name NASDAQ
ICFR Auditor Attestation Flag true
Entity Address, Postal Zip Code 14561
Entity Incorporation, State or Country Code 1T
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 331 Kifissias Avenue
Entity Address, Address Line Two Erithrea 14561
Entity Address, City or Town Athens
Entity Address, Country GR
Contact Personnel Name Harry N. Vafias
Country Region 30
City Area Code 210
Local Phone Number 625 0001
Entity Address, Postal Zip Code 14561