Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Operating activities
Net income	$ 8,789	$ 938	$ 5,141	$ 23,506	$ 14,355	$ 15,064
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity-based compensation					3,286	3,456
Loss (gain) on other investments, at fair value	160,174		10,644		167,503	58,704
Loss (gain) on other investments, sold not yet purchased	(134)		(7,591)		(936)	(28,590)
Loss (gain) on disposal of interest in Vellar GP					836	0
Noncash advisory fees received					(212,688)	(20,867)
(Income) loss from equity method affiliates	12,663		683		11,682	(22,366)	$ (21,704)
Depreciation and amortization	183		144		527	393
Amortization of discount on debt					385	(11)
Deferred tax provision (benefit)					919	(105)
Change in operating assets and liabilities, net:
Change in receivables from / payables to brokers, dealers, and clearing agencies					(31,857)	(55,575)
Change in receivables from / payables to related parties, net					(295)	(160)
(Increase) decrease in other receivables					(1,947)	(5,706)
(Increase) decrease in investments-trading					(3,777)	77,711
(Increase) decrease in receivables under resale agreements					253,549	(135,375)
(Increase) decrease in other assets					(432)	41
Increase (decrease) in accounts payable and other liabilities					28	(1,242)
Increase (decrease) in accrued compensation					68,218	4,185
Increase (decrease) in trading securities sold, not yet purchased					(1,042)	(22,305)
Increase (decrease) in securities sold under agreements to repurchase					(238,908)	137,790
Net cash provided by (used in) operating activities					29,406	5,042
Investing activities
Purchase of other investments, at fair value					(29,257)	(52,000)
Purchase of other investments sold, not yet purchased, at fair value					0	(1,408)
Reduction in cash from disposal of interest in Vellar GP					(433)	0
Sales and returns of principal - other investments, at fair value					44,240	63,988
Sales and returns of principal - other investments sold, not yet purchased, at fair value					199	214
Investment in equity method affiliate					(2,675)	(193)
Distribution from equity method affiliate					1,578	978
Purchase of furniture, equipment, and leasehold improvements					(823)	(789)
Net cash provided by (used in) investing activities					12,829	10,790
Financing activities
Repayment of redeemable financial instrument						(2,573)
Repayment of 2024 Note					(2,573)	0
Cash used to net share settle equity awards					(344)	(189)
Proceeds from issuance of common stock					0	154
Cohen & Company Inc. dividends					(1,695)	(1,465)
Convertible non-controlling interest distributions					(3,850)	(3,837)
Redemption of convertible non-controlling units					(954)	(659)
Non-convertible non-controlling interest investment					2,669	0
Non-convertible non-controlling interest distributions					(969)	(3,671)
Net cash provided by (used in) financing activities					(7,716)	(12,240)
Effect of exchange rate on cash					579	48
Net increase (decrease) in cash and cash equivalents					35,098	3,640
Cash and cash equivalents, beginning of period		$ 19,590		$ 10,650	19,590	10,650	10,650
Cash and cash equivalents, end of period	$ 54,688		$ 14,290		$ 54,688	$ 14,290	$ 19,590