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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Mar. 30, 2022
Jun. 30, 2021
Document And Entity Information [Abstract]        
Document Type 10-K      
Document Annual Report true      
Document Period End Date Dec. 31, 2021      
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 1333 Broadway, 10th 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      
Entity Shell Company false      
Entity Public Float       $ 32,782,040
Entity Common Stock, Shares Outstanding     19,571,119  
Auditor Name Marcum LLP CohnReznick LLP    
Auditor Firm ID 688 596    
Auditor Location New York, NY New York, New York    
Entity Central Index Key 0001083220      
Document Fiscal Year Focus 2021      
Document Fiscal Period Focus FY      
Amendment Flag false