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ACQUISITIONS - Pro forma (Details) - FRG Investment
 3 Months Ended
Mar. 31, 2023
USD ($)
$ / shares
shares
Business Acquisition [Line Items]  
Revenues $ 432,090,000
Net income attributable to B. Riley Financial, Inc. 14,870,000
Net income attributable to common shareholders $ 12,858,000
Basic loss per share (in dollars per share) | $ / shares $ 0.42
Diluted loss per share (in dollars per share) | $ / shares $ 0.41
Weighted average basic shares outstanding (in shares) | shares 30,676,246
Weighted average diluted shares outstanding (in shares) | shares 31,604,344