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EARNINGS PER SHARE - Schedule of basic and diluted earnings per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Net (loss) income attributable to B. Riley Financial, Inc. $ (49,165) $ 17,155
Preferred stock dividends (2,015) (2,012)
Net (loss) income available to common shareholders (51,180) 15,143
Net (loss) income available to common shareholders $ (51,180) $ 15,143
Weighted average common shares outstanding:    
Basic (in shares) 29,989,584 28,585,337
Effect of dilutive potential common shares:    
Restricted stock units and warrants (in shares) 0 928,098
Diluted (in shares) 29,989,584 29,513,435
Basic (loss) income per common share (in dollars per share) $ (1.71) $ 0.53
Diluted (loss) income per common share (in dollars per share) $ (1.71) $ 0.51