Note 5 - Derivative and Other Hedging Instruments - Schedule of To Be Announced Securities (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Dec. 31, 2024
Long [Member] | Five Percent 15 Year TBA Securities [Member]
Notional amount	[1]	$ 250,000	$ 50,000
Cost basis	[2]	252,422	50,074
Market value	[3]	252,715	49,742
Net carrying value	[4]	293	(332)
Short [Member] | Five and a Half Percent 30 Year TBA Securities [Member]
Cost basis	[2]	(284,018)
Market value	[3]	(284,445)
Net carrying value	[4]	(427)
Notional amount	[1]	(282,000)
Short [Member] | TBA Contracts [Member]
Cost basis	[2]	(31,596)	(124,332)
Market value	[3]	(31,730)	(119,961)
Net carrying value	[4]	(134)	4,371
Notional amount	[1]	$ (32,000)	(150,000)
Short [Member] | Three Percent 30 Year TBA Securities [Member]
Cost basis	[2]		(174,406)
Market value	[3]		(169,703)
Net carrying value	[4]		4,703
Notional amount	[1]		$ (200,000)

[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.