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Note 4 - Securitizations and Variable Interest Entities - Securitization (Details) $ in Thousands					12 Months Ended
	Nov. 26, 2024 USD ($) security	Aug. 15, 2024 USD ($) security	Nov. 16, 2023 USD ($) security	Oct. 12, 2023 USD ($) security	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Securitizations and Variable Interest Entities
Securities trading, at fair value					$ 83,529	$ 22,369
Recognized trading gain (loss)					1,600	0
Amount of first loss support			$ 16,200
Assets pledged as collateral | First loss support to Freddie Mac in conjunction with the M-series securitization
Securitizations and Variable Interest Entities
Interest rate swaps collateralized by investment securities					$ 74,000	$ 16,200
Tax exempt LIHTC loans
Securitizations and Variable Interest Entities
Securities trading, at fair value		$ 36,700
Recognized trading gain (loss)		473
Q-series Tax exempt LIHTC loans
Securitizations and Variable Interest Entities
Interest rate swaps collateralized by investment securities	$ 155,800		133,300
Securities trading, at fair value	23,600		6,200
Recognized trading gain (loss)	$ 1,400		$ 3,100
Number of securities issued | security	3		2
Q-series Tax exempt LIHTC loans | Assets pledged as collateral
Securitizations and Variable Interest Entities
Percentage of first loss support			12.00%
Class A Certificates
Securitizations and Variable Interest Entities
Proceeds from issue of certificates	$ 138,500		$ 134,600
Class A Certificates | Assets pledged as collateral
Securitizations and Variable Interest Entities
Percentage of first loss support	12.00%
Amount of first loss support	$ 18,900
Class X Certificates
Securitizations and Variable Interest Entities
Proceeds from issue of certificates	3,200		$ 6,100
M-series Tax exempt LIHTC loans
Securitizations and Variable Interest Entities
Interest rate swaps collateralized by investment securities		$ 230,700		$ 128,600
Securities trading, at fair value				16,200
Recognized trading gain (loss)				$ 2,400
Number of securities issued | security		2		2
Class A certificates | Assets pledged as collateral
Securitizations and Variable Interest Entities
Interest rate swaps collateralized by investment securities		$ 10,100		$ 7,500
Proceeds from issue of certificates		197,500		114,200
Investment securities pledged				3,800
Class B Certificates
Securitizations and Variable Interest Entities
Proceeds from issue of certificates	$ 18,900
Class B Certificates | Assets pledged as collateral
Securitizations and Variable Interest Entities
Proceeds from issue of certificates		$ 34,900		$ 15,600
Percentage of first loss support		15.00%		12.00%
Amount of first loss support		$ 34,900		$ 15,600

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