Note 20 - Earnings (Loss) Per Common Share - Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2024		Jun. 30, 2023	Jun. 30, 2024		Jun. 30, 2023
Net income / (loss) attributable to Cohen & Company Inc.		$ (2,349)		$ (6,601)	$ (326)		$ (9,238)
Add / (deduct): Adjustment (2)	[1]	18		0	(13)		0
Net income / (loss) on a fully converted basis		$ (8,359)		$ (6,601)	$ (1,154)		$ (9,238)
Weighted average common shares outstanding - Basic (in shares)		1,615,902		1,520,122	1,598,646		1,504,819
Unrestricted LLC Units exchangeable into Cohen & Company Inc. shares (1) (in shares)	[2]	4,066,458		0	4,058,941		0
Restricted units or shares (in shares)		0		0	0		0
Weighted average common shares outstanding - Diluted (3) (in shares)	[3]	5,682,360		1,520,122	5,657,587		1,504,819
Net income / (loss) per common share - Basic (in dollars per share)		$ (1.45)		$ (4.34)	$ (0.2)		$ (6.14)
Net income / (loss) per common share - Diluted (in dollars per share)		$ (1.47)		$ (4.34)	$ (0.2)		$ (6.14)
Non-controlling Interest of Cohen & Co. [Member]
Add: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc. (1)		$ (6,028)	[2]	$ (594)	$ (815)	[2]	$ (8,108)

[1] An adjustment is included because the Company would have incurred a higher income tax expense or realized a higher income tax benefit, as applicable, if the LLC Units had been converted at the beginning of the period.

[2] 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.

[3] Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows