Note 5 - Derivative and Other Hedging Instruments - Schedule of To Be Announced Securities (Details) - Short [Member] - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Five Percent TBA Securities [Member]
Notional amount	[1]	$ 50,000	$ 250,000
Cost basis	[2]	50,074	(242,725)
Market value	[3]	49,742	(247,657)
Net carrying value	[4]	(332)	(4,932)
Notional amount	[1]	(50,000)	(250,000)
Three Percent TBA Securities [Member]
Notional amount	[1]	200,000
Cost basis	[2]	(174,406)
Market value	[3]	(169,703)
Net carrying value	[4]	4,703
Notional amount	[1]	(200,000)
TBA Contracts [Member]
Notional amount	[1]	150,000	645,700
Cost basis	[2]	(124,332)	(624,413)
Market value	[3]	(119,961)	(637,107)
Net carrying value	[4]	4,371	(12,694)
Notional amount	[1]	$ (150,000)	(645,700)
Two Percent TBA Contract [Member]
Notional amount	[1]		70,700
Cost basis	[2]		(59,278)
Market value	[3]		(62,647)
Net carrying value	[4]		(3,369)
Notional amount	[1]		(70,700)
Five and a Half Percent TBA Securities [Member]
Notional amount	[1]		325,000
Cost basis	[2]		(322,410)
Market value	[3]		(326,803)
Net carrying value	[4]		(4,393)
Notional amount	[1]		$ (325,000)

[1] Notional amount represents the par value (or principal balance) of the underlying Agency RMBS.

[2] Cost basis represents the forward price to be paid (received) for the underlying Agency RMBS.

[3] Market value represents the current market value of the TBA securities (or of the underlying Agency RMBS) as of period-end.

[4] Net carrying value represents the difference between the market value and the cost basis of the TBA securities as of period-end and is reported in derivative assets (liabilities), at fair value in the balance sheets.