Note 16 - Equity - Rollforward of Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025
Balance		$ 48,555				$ 48,555
Non-controlling interest share of income (loss)						8,025
Other comprehensive (loss)						250
Acquisition / (surrender) of additional units of consolidated subsidiary						(499)
Equity-based compensation						2,311
Shares withheld for employee taxes						(241)
Distributions to convertible non-controlling interest of Cohen & Company Inc.						(3,850)
Redemption of convertible non-controlling interest units		(954)			$ (659)	(954)
Non-convertible non-controlling interest investment						2,669
Non-convertible non-controlling interest distributions	$ (125)	(1,236)	$ (165)	$ (3,567)		(1,361)
Balance	53,214					53,214
Sale of Equity Interest in Vellar GP [Member]
Sale of interest in Vellar GP		(1,691)				(1,691)
Operating LLC [Member]
Balance		37,093				37,093
Non-controlling interest share of income (loss)						15,192
Other comprehensive (loss)						250
Acquisition / (surrender) of additional units of consolidated subsidiary						(499)
Equity-based compensation						2,311
Shares withheld for employee taxes						(241)
Distributions to convertible non-controlling interest of Cohen & Company Inc.						(3,850)
Redemption of convertible non-controlling interest units						(954)
Non-convertible non-controlling interest investment						0
Non-convertible non-controlling interest distributions						0
Balance	49,302					49,302
Operating LLC [Member] | Sale of Equity Interest in Vellar GP [Member]
Sale of interest in Vellar GP						0
Other Consolidated Subsidiaries [Member]
Balance		$ 11,462				11,462
Non-controlling interest share of income (loss)						(7,167)
Other comprehensive (loss)						0
Acquisition / (surrender) of additional units of consolidated subsidiary						0
Equity-based compensation						0
Shares withheld for employee taxes						0
Distributions to convertible non-controlling interest of Cohen & Company Inc.						0
Redemption of convertible non-controlling interest units						0
Non-convertible non-controlling interest investment						2,669
Non-convertible non-controlling interest distributions						(1,361)
Balance	$ 3,912					3,912
Other Consolidated Subsidiaries [Member] | Sale of Equity Interest in Vellar GP [Member]
Sale of interest in Vellar GP						$ (1,691)