Note 23 - Related Party Transactions - Routine Transactions Recognized in the Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Asset management	$ 384	$ 453	$ 1,175	$ 1,427
Principal transactions and other income	(212)	567	(123)	353
Income (loss) from equity method affiliates	(12,663)	(683)	(11,682)	22,366	$ 21,704
Interest expense (income)	214	38	788	758
CREO JV [Member]
Asset management	125	173	407	544
Principal transactions and other income	(327)	506	(360)	389
U.S. Insurance JV [Member]
Asset management	259	280	768	883
Principal transactions and other income	68	61	175	(41)
CK Capital Value Fund [Member]
Principal transactions and other income	17	0	17	0
Columbus Circle SPAC [Member]
Principal transactions and other income	30	0	45	0
Income (loss) from equity method affiliates	(335)	0	(1,642)	0
Other SPAC Sponsor Entities [Member]
Principal transactions and other income	0	0	0	5
Income (loss) from equity method affiliates	(12,268)	(466)	(10,829)	22,710
Dutch Real Estate Entities [Member]
Income (loss) from equity method affiliates	(60)	(217)	789	(344)
Equity Method Affiliates [Member]
Income (loss) from equity method affiliates	(12,663)	(683)	(11,682)	22,366
Operating expense (income)	(25)	(26)	(35)	(78)
Cohen Circle LLC [Member]
Operating expense (income)	(25)	(26)	(35)	(78)
JKD Investor [Member]
Interest expense (income)	$ 214	$ 38	$ 788	$ 758