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Note 31 - Related Party Transactions - Routine Transactions Recognized in the Statements of Operations (Details) - USD ($) $ in Thousands	1 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Principal transactions and other income									$ 770	$ 564	$ 744
Income (loss) from equity method affiliates	$ (244)	$ (1,371)	$ (1,233)	$ (107)	$ (188)	$ (109)	$ (248)	$ (8)	(2,955)	(553)
Operating expense (income)									1,150	428	491
Interest expense (income)									5,462	3,952	4,645
Asset Management [Member]
Asset Management									2,774	870	344
TBBK [Member]
Net trading										14	43
EuroDekania Management Limited [Member]
Principal transactions and other income										279	709
EuroDekania Management Limited [Member] | Asset Management [Member]
Asset Management										236	235
SPAC Funds [Member]
Principal transactions and other income									183	30	(8)
Income (loss) from equity method affiliates									81
SPAC Funds [Member] | Asset Management [Member]
Asset Management									2,406	331	51
U.S. Insurance JV [Member]
Principal transactions and other income									222	150	25
U.S. Insurance JV [Member] | Asset Management [Member]
Asset Management									368	303	58
CK Capital Partners B.V. [Member]
Principal transactions and other income									147
Income (loss) from equity method affiliates									279
Insurance SPAC [Member]
Principal transactions and other income									95	95
Income (loss) from equity method affiliates									(3,138)	(553)
Insurance SPAC II [Member]
Principal transactions and other income									80
Income (loss) from equity method affiliates									(486)
Insurance SPAC III Sponsor Entities [Member]
Principal transactions and other income									20
Income (loss) from equity method affiliates									(34)
FTAC II Sponsor [Member]
Principal transactions and other income											17
FTAC III Sponsor [Member]
Principal transactions and other income									9	10	1
FTAC IV Sponsor [Member]
Principal transactions and other income									5
Income (loss) from equity method affiliates									(7)
FTAC V Sponsor [Member]
Principal transactions and other income									2
Income (loss) from equity method affiliates									(2)
FTAC Olympus Sponsor [Member]
Principal transactions and other income									7
Income (loss) from equity method affiliates									(9)
AOI [Member]
Income (loss) from equity method affiliates									360
Duane Morris [Member]
Operating expense (income)									1,194	462	501
FinTech Masala [Member]
Operating expense (income)									(44)	(34)	(10)
CBF [Member]
Interest expense (income)									1,191	912	470
DGC Trust [Member]
Interest expense (income)									1,804	1,725	1,562
EBC [Member]
Interest expense (income)									289	218	228
Edward E. Cohen IRA [Member]
Interest expense (income)									47	398	417
JKD Capital Partners I, LTD [Member]
Interest expense (income)									$ 2,131	$ 699	$ 1,968

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