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Note 21 - Equity - Shares Outstanding of Stockholders' Equity of the Company (Details) - shares		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Repurchase and retirement of common stock (in shares)		(1,211,810)	(318,900)	(750,810)
Cohen & Company [Member]
Shares, outstanding (in shares)	[1]	1,193,624	1,204,196	1,213,022
Issuance of shares (in shares)
Issuance as equity-based compensation (in shares)		268,129	36,875	73,685
Vesting of shares (in shares)
Vesting of shares (in shares)
Shares withheld for employee taxes (in shares)		(15,043)	(15,557)	(7,430)
Forfeiture / cancellation of restricted stock (in shares)
Repurchase and retirement of common stock (in shares)		(121,181)	(31,890)	(75,081)
Forfeiture / cancellation of restricted stock (in shares)
Shares, outstanding (in shares)	[1]	1,325,529	1,193,624	1,204,196
Cohen & Company [Member] | Restricted Stock [Member]
Shares, outstanding (in shares)	[1]	73,715	93,479	76,932
Issuance of shares (in shares)
Issuance as equity-based compensation (in shares)		268,129	36,875	73,685
Vesting of shares (in shares)		55,278	56,639	57,138
Vesting of shares (in shares)		(55,278)	(56,639)	(57,138)
Shares withheld for employee taxes (in shares)
Forfeiture / cancellation of restricted stock (in shares)
Repurchase and retirement of common stock (in shares)
Forfeiture / cancellation of restricted stock (in shares)
Shares, outstanding (in shares)	[1]	286,566	73,715	93,479
Cohen & Company [Member] | Common Stock [Member]
Shares, outstanding (in shares)	[1]	1,119,909	1,110,717	1,136,090
Issuance of shares (in shares)
Issuance as equity-based compensation (in shares)
Vesting of shares (in shares)		55,278	56,639	57,138
Vesting of shares (in shares)		(55,278)	(56,639)	(57,138)
Shares withheld for employee taxes (in shares)		(15,043)	(15,557)	(7,430)
Forfeiture / cancellation of restricted stock (in shares)
Repurchase and retirement of common stock (in shares)		(121,181)	(31,890)	(75,081)
Forfeiture / cancellation of restricted stock (in shares)
Shares, outstanding (in shares)	[1]	1,038,963	1,119,909	1,110,717
[1] Excludes remaining restricted units of Cohen & Company Inc. Common Stock. See note 22.

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