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Document And Entity Information
 12 Months Ended
Dec. 31, 2019
shares
Document Information [Line Items]  
Entity Registrant Name EUROSEAS LTD.
Entity Central Index Key 0001341170
Current Fiscal Year End Date --12-31
Entity Filer Category Non-accelerated Filer
Entity Current Reporting Status Yes
Entity Voluntary Filers No
Entity Well-known Seasoned Issuer No
Entity Emerging Growth Company false
Entity Interactive Data Current Yes
Entity Common Stock, Shares Outstanding (in shares) 5,600,259
Entity Shell Company false
Document Type 20-F
Document Period End Date Dec. 31, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Amendment Flag false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false