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Note 31 - Related Party Transactions - Routine Transactions Recognized in the Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Principal transactions and other income	$ 2,970	$ 770	$ 564
Income (loss) from equity method affiliates	36,010	(2,955)	(553)
Operating expense (income)	871	1,150	428
Interest expense (income)	3,927	5,462	3,952
Asset Management [Member]
Asset Management	5,171	2,774	870
TBBK [Member]
Net trading	0	0	14
EuroDekania Management Limited [Member]
Principal transactions and other income	0	0	279
EuroDekania Management Limited [Member] | Asset Management [Member]
Asset Management	0	0	236
SPAC Fund [Member]
Asset Management	4,327	2,406	331
Principal transactions and other income	474	183	30
Other SPAC Sponsor Entities [Member]
Asset Management	319		0
Principal transactions and other income	132	23	10
Income (loss) from equity method affiliates	37,453	63	0
U.S. Insurance JV [Member]
Principal transactions and other income	142	222	150
U.S. Insurance JV [Member] | Asset Management [Member]
Asset Management	525	368	303
Dutch Real Estate Entities [Member]
Principal transactions and other income	137	147	0
Income (loss) from equity method affiliates	(137)	639	0
Insurance SPAC [Member]
Principal transactions and other income	0	95	95
Income (loss) from equity method affiliates	0	(3,138)	(553)
Insurance SPAC II [Member]
Principal transactions and other income	40	80	0
Income (loss) from equity method affiliates	(107)	(486)	0
Insurance SPAC III Sponsor Entities [Member]
Principal transactions and other income	240	20	0
Income (loss) from equity method affiliates	(1,200)	(34)	0
Stoa USA, Inc. [Member]
Principal transactions and other income	1,805	0	0
Related Parties [Member]
Income (loss) from equity method affiliates	36,009	(2,956)	(553)
Duane Morris [Member]
Operating expense (income)	925	1,194	462
FinTech Masala [Member]
Operating expense (income)	(54)	(44)	(34)
CBF [Member]
Interest expense (income)	197	1,191	912
DGC Trust [Member]
Interest expense (income)	1,534	1,804	1,725
EBC [Member]
Interest expense (income)	211	289	218
Pensco Trust Company, Custodian fbo Edward E. Cohen IRA [Member]
Interest expense (income)	0	47	398
JKD Capital Partners I, LTD [Member]
Interest expense (income)	$ 1,985	$ 2,131	$ 699

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