Note 22 - Segment and Geographic Information - Statements of Operations Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Net trading		$ 9,848	$ 8,210
Principal transactions and other income		(18,389)	(2,311)
Revenues		18,564	8,824
Compensation		14,839	10,537
Other Operating Expense		7,100	5,770
Total operating expenses		21,939	16,307
Operating income (loss)		(3,375)	(7,483)
Interest income (expense)		(1,666)	(1,592)
Earnings / (loss) recognized		29,045	(395)
Income (loss) before income taxes		24,004	(9,470)
Income tax expense (benefit)		498	584
Net income (loss)		23,506	(10,054)
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC	[1]	(5,213)	7,514
Net income (loss) attributable to Cohen & Company Inc.		2,023	(2,637)
Depreciation and amortization (included in total operating expense)		124	144
Non-controlling Interest of Operating LLC [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		16,270	97
Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		7,236	(10,151)
Non-controlling Interest of Cohen & Co. [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		5,213	(7,514)
Asset Management [Member]
Revenues, total		2,717	2,025
New Issue and Advisory [Member]
Revenues, total		24,388	900
Operating Segments [Member]
Net trading		9,848	8,210
Principal transactions and other income		(18,389)	(2,311)
Revenues		18,564	8,824
Compensation		14,516	8,612
Other Operating Expense		5,092	4,435
Total operating expenses		19,608	13,047
Operating income (loss)		(1,044)	(4,223)
Interest income (expense)		(20)	(65)
Earnings / (loss) recognized		29,045	(395)
Income (loss) before income taxes		27,981	(4,683)
Income tax expense (benefit)		0	0
Net income (loss)		27,981	(4,683)
Net income (loss) attributable to Cohen & Company Inc.		11,711	(4,780)
Depreciation and amortization (included in total operating expense)		1	2
Operating Segments [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		16,270	97
Operating Segments [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		11,711	(4,780)
Operating Segments [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		0	0
Operating Segments [Member] | Asset Management [Member]
Revenues, total		2,717	2,025
Operating Segments [Member] | New Issue and Advisory [Member]
Revenues, total		24,388	900
Operating Segments [Member] | Capital Markets [Member]
Net trading		9,848	8,210
Principal transactions and other income		0	0
Revenues		34,236	9,110
Compensation		12,344	6,946
Other Operating Expense		4,151	3,649
Total operating expenses		16,495	10,595
Operating income (loss)		17,741	(1,485)
Interest income (expense)		(20)	(65)
Earnings / (loss) recognized		0	0
Income (loss) before income taxes		17,721	(1,550)
Income tax expense (benefit)		0	0
Net income (loss)		17,721	(1,550)
Net income (loss) attributable to Cohen & Company Inc.		17,721	(1,550)
Depreciation and amortization (included in total operating expense)		0	0
Operating Segments [Member] | Capital Markets [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		0	0
Operating Segments [Member] | Capital Markets [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		17,721	(1,550)
Operating Segments [Member] | Capital Markets [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		0	0
Operating Segments [Member] | Capital Markets [Member] | Asset Management [Member]
Revenues, total		0	0
Operating Segments [Member] | Capital Markets [Member] | New Issue and Advisory [Member]
Revenues, total		24,388	900
Operating Segments [Member] | Asset Management Segment [Member]
Net trading		0	0
Principal transactions and other income		548	240
Revenues		3,265	2,265
Compensation		1,679	1,431
Other Operating Expense		670	568
Total operating expenses		2,349	1,999
Operating income (loss)		916	266
Interest income (expense)		0	0
Earnings / (loss) recognized		0	0
Income (loss) before income taxes		916	266
Income tax expense (benefit)		0	0
Net income (loss)		916	266
Net income (loss) attributable to Cohen & Company Inc.		916	152
Depreciation and amortization (included in total operating expense)		1	2
Operating Segments [Member] | Asset Management Segment [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		0	114
Operating Segments [Member] | Asset Management Segment [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		916	152
Operating Segments [Member] | Asset Management Segment [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		0	0
Operating Segments [Member] | Asset Management Segment [Member] | Asset Management [Member]
Revenues, total		2,717	2,025
Operating Segments [Member] | Asset Management Segment [Member] | New Issue and Advisory [Member]
Revenues, total		0	0
Operating Segments [Member] | Principal Investing [Member]
Net trading		0	0
Principal transactions and other income		(18,937)	(2,551)
Revenues		(18,937)	(2,551)
Compensation		493	235
Other Operating Expense		271	218
Total operating expenses		764	453
Operating income (loss)		(19,701)	(3,004)
Interest income (expense)		0	0
Earnings / (loss) recognized		29,045	(395)
Income (loss) before income taxes		9,344	(3,399)
Income tax expense (benefit)		0	0
Net income (loss)		9,344	(3,399)
Net income (loss) attributable to Cohen & Company Inc.		(6,926)	(3,382)
Depreciation and amortization (included in total operating expense)		0	0
Operating Segments [Member] | Principal Investing [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		16,270	(17)
Operating Segments [Member] | Principal Investing [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		(6,926)	(3,382)
Operating Segments [Member] | Principal Investing [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC		0	0
Operating Segments [Member] | Principal Investing [Member] | Asset Management [Member]
Revenues, total		0	0
Operating Segments [Member] | Principal Investing [Member] | New Issue and Advisory [Member]
Revenues, total		0	0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Net trading	[2]	0	0
Principal transactions and other income	[2]	0	0
Revenues	[2]	0	0
Compensation	[2]	323	1,925
Other Operating Expense	[2]	2,008	1,335
Total operating expenses	[2]	2,331	3,260
Operating income (loss)	[2]	(2,331)	(3,260)
Interest income (expense)	[2]	(1,646)	(1,527)
Earnings / (loss) recognized	[2]	0	0
Income (loss) before income taxes	[2]	(3,977)	(4,787)
Income tax expense (benefit)	[2]	498	584
Net income (loss)	[2]	(4,475)	(5,371)
Net income (loss) attributable to Cohen & Company Inc.	[2]	(9,688)	2,143
Depreciation and amortization (included in total operating expense)	[2]	123	142
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC	[2]	0	0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)	[2]	(4,475)	(5,371)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net income attributable to the non-convertible non-controlling interest of the Operating LLC	[2]	5,213	(7,514)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Asset Management [Member]
Revenues, total	[2]	0	0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | New Issue and Advisory [Member]
Revenues, total	[2]	$ 0	$ 0

[1] The LLC Units not held by Cohen & Company Inc. (that is, those held by the non-controlling interest) may be redeemed and exchanged into shares of the Company on a ten-for-one basis. The LLC Units not held by Cohen & Company Inc. are redeemable, at the member’s option at any time, for (i) cash in an amount equal to the average of the per share closing prices of the Common Stock for the ten consecutive trading days immediately preceding the date the Company receives the member’s redemption notice, or (ii) at the Company’s option, one tenth of a share of the Common Stock, subject, in each case, to appropriate adjustment upon the occurrence of an issuance of additional shares of the Common Stock as a dividend or other distribution on the outstanding Common Stock, or a further subdivision or combination of the outstanding shares of the Common Stock. These LLC Units are not included in the computation of basic earnings per share. These LLC Units enter into the computation of diluted net income (loss) per common share when the effect is not anti-dilutive using the if-converted method.

[2] Unallocated assets primarily include: (i) amounts due from related parties; (ii) furniture and equipment, net; and (iii) other assets that are not considered necessary for an understanding of business segment assets. Such amounts are excluded in business segment reporting to the chief operating decision maker.