| Document and Entity Information | Apr. 14, 2022 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 14, 2022 |
| 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 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | XELB |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001083220 |
| Amendment Flag | false |
