Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	FocalPoint Securities, LLC ("FocalPoint")	Preferred Stock	Common Stock	Common Stock Farber	Common Stock FocalPoint Securities, LLC ("FocalPoint")	Additional Paid-in Capital	Additional Paid-in Capital FocalPoint Securities, LLC ("FocalPoint")	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding (in shares)				27,591,028
Balance (in shares) at Dec. 31, 2021			4,512
Balance at Dec. 31, 2021	$ 705,201		$ 0	$ 3			$ 413,486		$ 248,862	$ (1,080)	$ 43,930
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock issued (in shares)			23
Preferred stock issued	639						639
Vesting of restricted stock and other, net of shares withheld for employer taxes (in shares)				32,328
Vesting of restricted stock and other, net of shares withheld for employer taxes	(1,294)						(1,294)
Shares issued for the acquisition of a business (in shares)						304,878
Shares issued for the acquisition of a business		$ 20,320						$ 20,320
Share based payments	17,013						17,013
Dividends on common stock	(31,033)								(31,033)
Dividends on preferred stock	(2,002)								(2,002)
Net income	(9,196)								(10,062)		866
Distributions to noncontrolling interests	(935)										(935)
Contributions from noncontrolling interests	1,770										1,770
Acquisition of noncontrolling interests	182										182
Other comprehensive income	(488)									(488)
Balance (in shares) at Mar. 31, 2022			4,535
Balance at Mar. 31, 2022	$ 700,177		$ 0	$ 3			450,164		205,765	(1,568)	45,813
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding (in shares)				27,928,234
Common stock, shares outstanding (in shares)	28,523,764			28,523,764
Balance (in shares) at Dec. 31, 2022			4,545
Balance at Dec. 31, 2022	$ 505,893		$ 0	$ 3			494,201		(45,220)	(2,470)	59,379
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock issued (in shares)			18
Preferred stock issued	467						467
Vesting of restricted stock and other, net of shares withheld for employer taxes (in shares)				1,012,751
Vesting of restricted stock and other, net of shares withheld for employer taxes	(4,819)						(4,819)
Common stock repurchased and retired (in shares)				(1,452,831)
Common stock repurchased and retired	(53,803)						(53,803)
Shares issued for the acquisition of a business (in shares)					51,952
Shares issued for the acquisition of a business	2,111						2,111
Remeasurement of Lingo redeemable minority interest	(6,483)						(6,483)
Share based payments	13,678						13,678
Dividends on common stock	(31,291)								(31,291)
Dividends on preferred stock	(2,012)								(2,012)
Net income	16,706								17,155		(449)
Distributions to noncontrolling interests	(720)										(720)
Contributions from noncontrolling interests	431										431
Remeasurement of B. Riley Principal 250 Merger Corporation subsidiary temporary equity	(1,198)								(1,198)
Acquisition of noncontrolling interest	538										538
Other comprehensive income	866									866
Balance (in shares) at Mar. 31, 2023			4,563
Balance at Mar. 31, 2023	$ 440,364		$ 0	$ 3			$ 445,352		$ (62,566)	$ (1,604)	$ 59,179
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding (in shares)	28,135,636			28,135,636