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Note 5 - Net Trading - Net Trading (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net realized gains / (losses)- trading inventory	$ 31,269	$ 24,118	$ 20,914
Net unrealized gains / (losses)-trading inventory	2,076	(1,320)	1,236
Gains and losses	33,345	22,798	22,150
Interest income-trading inventory	7,759	6,921	5,040
Interest income - RTLs		236
Interest income-receivables under resale agreements	98,710	176,336	67,846
Interest income	106,469	183,493	72,886
Interest expense-securities sold under agreement to repurchase	(65,030)	(164,851)	(63,707)
Interest expense-LegacyTexas Credit Facility	(39)	(100)
Interest expense-margin payable	(1,134)	(3,168)	(2,031)
Interest expense	(66,203)	(168,119)	(65,738)
Net trading	$ 73,611	$ 38,172	$ 29,298

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