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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 02, 2025
Apr. 07, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Goodwill and Intangible Assets [Line Items]            
Amortization of intangible assets     $ 5,700 $ 5,900 $ 16,599 $ 17,710
B Riley Financial Inc. [Member]            
Schedule of Goodwill and Intangible Assets [Line Items]            
Date of acquisition   Apr. 07, 2025        
Bryan Garnier [Member]            
Schedule of Goodwill and Intangible Assets [Line Items]            
Date of acquisition Jun. 02, 2025          
Liability for estimated earn-out payments $ 25,000          
Estimated future operating results 5 years          
Customer Relationships [Member]            
Schedule of Goodwill and Intangible Assets [Line Items]            
Weighted-average remaining lives of intangible assets     8 years 9 months 18 days   8 years 9 months 18 days  
Trade Names [Member]            
Schedule of Goodwill and Intangible Assets [Line Items]            
Weighted-average remaining lives of intangible assets     5 years 7 months 6 days   5 years 7 months 6 days  
Non-Compete Agreements [Member]            
Schedule of Goodwill and Intangible Assets [Line Items]            
Weighted-average remaining lives of intangible assets     3 years 3 months 18 days   3 years 3 months 18 days  
Acquired Technology [Member]            
Schedule of Goodwill and Intangible Assets [Line Items]            
Weighted-average remaining lives of intangible assets     8 years 1 month 6 days   8 years 1 month 6 days  
Investment Banking Backlog [Member]            
Schedule of Goodwill and Intangible Assets [Line Items]            
Weighted-average remaining lives of intangible assets     4 months 24 days   4 months 24 days