Note 21 - Segment and Geographic Information - Statements of Operations Information (Details) - USD ($) $ in Thousands		3 Months Ended				12 Months Ended
		Mar. 31, 2026		Mar. 31, 2025		Dec. 31, 2025
Net trading		$ 13,200		$ 9,211
Principal transactions		(3,915)		(2,330)
Other income		487		(325)
Revenues		57,902		28,740
Compensation		41,307		21,666
Business development		1,257		829
Occupancy and equipment		1,126		1,000
Subscriptions, clearing, and execution		3,952		2,174
Professional Fees		4,924		2,792
Depreciation and amortization		203		172
Total operating expenses		52,769		28,633
Operating income (loss)		5,133		107
Interest expense		(1,335)		(1,448)
Income (Loss) from Equity Method Investments		(527)		2,418		$ (16,763)
Income (loss) before income taxes		3,271		1,077
Income tax expense (benefit)		(182)		139
Net income (loss)		3,453		938
Net income (loss) attributable to Cohen & Company Inc.		$ 1,492		$ 329
Compensation as a percentage of revenue		71.34%		75.39%
Operating income / (loss) as a percentage of revenue		8.86%		0.37%
Net income / (loss) as a percentage of revenue		5.96%		3.26%
Net income / (loss) attributable to Cohen & Company Inc. as a percentage of revenue		2.58%		1.14%
Non-controlling Interest of Operating LLC [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		$ (718)		$ (173)
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		(718)		(173)
Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		4,171		1,111
Non-controlling Interest of Cohen & Co. [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC	[1]	2,679		782
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.	[1]	2,679		782
Compensation [Member]
Compensation		41,307		21,666
Investment Banking and New Issue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		45,711		20,164
Asset Management [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		2,419		2,020
Operating Segments [Member]
Net trading		13,200		9,211
Principal transactions		(3,915)		(2,330)
Other income		487		(325)
Revenues		57,902		28,740
Business development		1,027		435
Occupancy and equipment		850		720
Subscriptions, clearing, and execution		3,892		2,121
Professional Fees		3,301		1,799
Depreciation and amortization		2		2
Total operating expenses		46,761		24,777
Operating income (loss)		11,141		3,963
Interest expense		(44)		(18)
Income (Loss) from Equity Method Investments		(527)		2,418
Income (loss) before income taxes		10,570		6,363
Income tax expense (benefit)		65		0
Net income (loss)		10,505		6,363
Net income (loss) attributable to Cohen & Company Inc.		$ 11,223		$ 6,536
Compensation as a percentage of revenue		65.09%		68.55%
Operating income / (loss) as a percentage of revenue		19.24%		13.79%
Net income / (loss) as a percentage of revenue		18.14%		22.14%
Net income / (loss) attributable to Cohen & Company Inc. as a percentage of revenue		19.38%		22.74%
Operating Segments [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		$ (718)		$ (173)
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		(718)		(173)
Operating Segments [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		11,223		6,536
Operating Segments [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		0		0
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		0		0
Operating Segments [Member] | Compensation [Member]
Compensation		37,689		19,700
Operating Segments [Member] | Investment Banking and New Issue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		45,711		20,164
Operating Segments [Member] | Asset Management [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		2,419		2,020
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Net trading	[2]	0		0
Principal transactions	[2]	0		0
Other income	[2]	0		0
Revenues	[2]	0		0
Business development	[2]	230		394
Occupancy and equipment	[2]	276		280
Subscriptions, clearing, and execution	[2]	60		53
Professional Fees	[2]	1,623		993
Depreciation and amortization	[2]	201		170
Total operating expenses	[2]	6,008		3,856
Operating income (loss)	[2]	(6,008)		(3,856)
Interest expense		(1,291)		(1,430)
Income (Loss) from Equity Method Investments	[2]	0		0
Income (loss) before income taxes	[2]	(7,299)		(5,286)
Income tax expense (benefit)	[2]	(247)		139
Net income (loss)	[2]	(7,052)		(5,425)
Net income (loss) attributable to Cohen & Company Inc.	[2]	(9,731)		(6,207)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC	[2]	0		0
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.	[2]	0		0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)	[2]	(7,052)		(5,425)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		2,679	[2]	782
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		2,679	[2]	782
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Compensation [Member]
Compensation		3,618		1,966	[2]
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Investment Banking and New Issue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		0		0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Asset Management [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		0	[2]	0
Capital Markets [Member] | Operating Segments [Member]
Net trading		13,200		9,211
Principal transactions		0		0
Other income		0		0
Revenues		58,911		29,375
Business development		930		376
Occupancy and equipment		793		669
Subscriptions, clearing, and execution		3,799		2,009
Professional Fees		2,822		1,244
Depreciation and amortization		0		0
Total operating expenses		44,186		22,441
Operating income (loss)		14,725		6,934
Interest expense		(44)		(18)
Income (Loss) from Equity Method Investments		0		0
Income (loss) before income taxes		14,681		6,916
Income tax expense (benefit)		0		0
Net income (loss)		14,681		6,916
Net income (loss) attributable to Cohen & Company Inc.		$ 14,681		$ 6,916
Compensation as a percentage of revenue		60.84%		61.76%
Operating income / (loss) as a percentage of revenue		25.00%		23.61%
Net income / (loss) as a percentage of revenue		24.92%		23.54%
Net income / (loss) attributable to Cohen & Company Inc. as a percentage of revenue		24.92%		23.54%
Capital Markets [Member] | Operating Segments [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		$ 0		$ 0
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		0		0
Capital Markets [Member] | Operating Segments [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		14,681		6,916
Capital Markets [Member] | Operating Segments [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		0		0
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		0		0
Capital Markets [Member] | Operating Segments [Member] | Compensation [Member]
Compensation		35,842		18,143
Capital Markets [Member] | Operating Segments [Member] | Investment Banking and New Issue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		45,711		20,164
Capital Markets [Member] | Operating Segments [Member] | Asset Management [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		0		0
Asset Management Segment [Member] | Operating Segments [Member]
Net trading		0		0
Principal transactions		0		0
Other income		290		438
Revenues		2,709		2,458
Business development		97		58
Occupancy and equipment		57		51
Subscriptions, clearing, and execution		93		86
Professional Fees		465		372
Depreciation and amortization		2		2
Total operating expenses		2,531		1,968
Operating income (loss)		178		490
Interest expense		0		0
Income (Loss) from Equity Method Investments		0		0
Income (loss) before income taxes		178		490
Income tax expense (benefit)		65		0
Net income (loss)		113		490
Net income (loss) attributable to Cohen & Company Inc.		$ 113		$ 490
Compensation as a percentage of revenue		67.07%		56.92%
Operating income / (loss) as a percentage of revenue		6.57%		19.93%
Net income / (loss) as a percentage of revenue		4.17%		19.93%
Net income / (loss) attributable to Cohen & Company Inc. as a percentage of revenue		4.17%		19.93%
Asset Management Segment [Member] | Operating Segments [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		$ 0		$ 0
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		0		0
Asset Management Segment [Member] | Operating Segments [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		113		490
Asset Management Segment [Member] | Operating Segments [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		0		0
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		0		0
Asset Management Segment [Member] | Operating Segments [Member] | Compensation [Member]
Compensation		1,817		1,399
Asset Management Segment [Member] | Operating Segments [Member] | Investment Banking and New Issue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		0		0
Asset Management Segment [Member] | Operating Segments [Member] | Asset Management [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		2,419		2,020
Principal Investing [Member] | Operating Segments [Member]
Net trading		0		0
Principal transactions		(3,915)		(2,330)
Other income		197		(763)
Revenues		(3,718)		(3,093)
Business development		0		1
Occupancy and equipment		0		0
Subscriptions, clearing, and execution		0		26
Professional Fees		14		183
Depreciation and amortization		0		0
Total operating expenses		44		368
Operating income (loss)		(3,762)		(3,461)
Interest expense		0		0
Income (Loss) from Equity Method Investments		(527)		2,418
Income (loss) before income taxes		(4,289)		(1,043)
Income tax expense (benefit)		0		0
Net income (loss)		(4,289)		(1,043)
Net income (loss) attributable to Cohen & Company Inc.		$ (3,571)		$ (870)
Compensation as a percentage of revenue		(0.81%)		(5.11%)
Operating income / (loss) as a percentage of revenue		101.18%		111.90%
Net income / (loss) as a percentage of revenue		115.36%		33.72%
Net income / (loss) attributable to Cohen & Company Inc. as a percentage of revenue		96.05%		28.13%
Principal Investing [Member] | Operating Segments [Member] | Non-controlling Interest of Operating LLC [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		$ (718)		$ (173)
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		(718)		(173)
Principal Investing [Member] | Operating Segments [Member] | Cohen Co Including Noncontrolling Interest [Member]
Net income (loss)		(3,571)		(870)
Principal Investing [Member] | Operating Segments [Member] | Non-controlling Interest of Cohen & Co. [Member]
Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC		0		0
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc.		0		0
Principal Investing [Member] | Operating Segments [Member] | Compensation [Member]
Compensation		30		158
Principal Investing [Member] | Operating Segments [Member] | Investment Banking and New Issue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		0		0
Principal Investing [Member] | Operating Segments [Member] | Asset Management [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 0		$ 0

[1] The units of membership interests in the Operating LLC (“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 includes certain expenses incurred by indirect overhead and support departments (such as the executive, finance, legal, information technology, human resources, risk, compliance, and other similar overhead and support departments). Some of the items not allocated include: (1) operating expenses (such as cash compensation and benefits, equity-based compensation expense, professional fees, travel and entertainment, consulting fees, and rent) related to support departments excluding certain departments that directly support the Capital Markets business segment; (2) interest expense on debt; and (3) income taxes. Management does not consider these items necessary for an understanding of the operating results of these business segments and such amounts are excluded in business segment reporting to the CODM.