Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Services and fees	$ 85,141	$ 50,300	$ 202,354	$ 90,505
Interest income - Securities lending	7,206		9,424
Sale of goods	79	6,666	221	6,668
Total revenues	92,426	56,966	211,999	97,173
Operating expenses:
Direct cost of services	10,138	12,841	46,224	25,084
Cost of goods sold	124	2,391	313	2,393
Selling, general and administrative expenses	70,962	22,727	132,836	48,844
Restructuring charge	4,896	3,585	11,484	3,585
Interest expense - Securities lending	4,950		6,515
Total operating expenses	91,070	41,544	197,372	79,906
Operating income	1,356	15,422	14,627	17,267
Other income (expense):
Interest income	76	26	358	32
Loss from equity investment	(157)		(157)
Interest expense	(2,510)	(991)	(5,195)	(1,398)
(Loss) income before income taxes	(1,235)	14,457	9,633	15,901
Benefit from (provision for) income taxes	1,357	(6,083)	7,753	(6,184)
Net income	122	8,374	17,386	9,717
Net (loss) income attributable to noncontrolling interests	(246)	(565)	(283)	631
Net income attributable to B. Riley Financial, Inc.	$ 368	$ 8,939	$ 17,669	$ 9,086
Basic income per share (in dollars per share)	$ 0.01	$ 0.47	$ 0.80	$ 0.51
Diluted income per share (in dollars per share)	0.01	0.47	0.76	0.50
Cash dividends per share (in dollars per share)	$ 0.13	$ 0.03	$ 0.55	$ 0.03
Weighted average basic shares outstanding (in shares)	26,059,490	18,977,072	22,180,808	17,805,127
Weighted average diluted shares outstanding (in shares)	27,639,862	19,191,035	23,385,014	18,009,158