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Earnings (Loss) Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Earnings (Loss) Per Share [Abstract]    
Net loss attributable to Xcel Brands, Inc. stockholders $ (21,052) $ (4,018)
Basic weighted average number of shares outstanding 19,711,637 19,624,669
Diluted weighted average number of shares outstanding 19,711,637 19,624,669
Basic net loss income per share $ (1.07) $ (0.20)
Diluted net loss income per share $ (1.07) $ (0.20)