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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Apr. 03, 2024
Jun. 30, 2023
Document And Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37527    
Entity Registrant Name XCEL BRANDS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 76-0307819    
Entity Address, Address Line One 550 Seventh Avenue, 11th Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10018    
City Area Code 347    
Local Phone Number 727-2474    
Title of 12(b) Security Common Stock, $0.001 par value per share    
Trading Symbol XELB    
Security Exchange Name NASDAQ    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 17,934,000
Entity Common Stock, Shares Outstanding   23,492,117  
Auditor Name Marcum LLP    
Auditor Firm ID 688    
Auditor Location New York, NY    
Entity Central Index Key 0001083220    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false