Note 5 - Derivative and Other Hedging Instruments - Schedule of To Be Announced Securities (Details) - USD ($) $ in Thousands		Dec. 31, 2025	Dec. 31, 2024
Three Percent 30 Year TBA Securities [Member]
Cost basis	[1],[2]	$ (343)
Market value	[2],[3]	0
Net carrying value	[2],[4]	343
Notional amount	[2],[5]	0
Notional amount	[2],[5]	0
Three and a Half Percent 30-year TBA Securities [Member]
Cost basis	[1],[2]	34
Market value	[2],[3]	0
Net carrying value	[2],[4]	(34)
Notional amount	[2],[5]	0
Notional amount	[2],[5]	0
Four Percent 30-year TBA Securities [Member]
Cost basis	[1],[2]	(215)
Market value	[2],[3]	0
Net carrying value	[2],[4]	215
Notional amount	[2],[5]	0
Notional amount	[2],[5]	0
Five Percent 30-year TBA Securities [Member]
Cost basis	[1],[2]	218
Market value	[2],[3]	0
Net carrying value	[2],[4]	(218)
Notional amount	[2],[5]	0
Notional amount	[2],[5]	0
Long [Member] | Four and a Half Percent 15-year TBA Securities [Member]
Notional amount	[5]	250,000
Cost basis	[1]	249,998
Market value	[3]	250,186
Net carrying value	[4]	188
Long [Member] | Five Percent 15 Year TBA Securities [Member]
Notional amount	[5]		$ 50,000
Cost basis	[1]		50,074
Market value	[3]		49,742
Net carrying value	[4]		(332)
Short [Member] | Three Percent 30 Year TBA Securities [Member]
Cost basis	[1]		(174,406)
Market value	[3]		(169,703)
Net carrying value	[4]		4,703
Notional amount	[5]		(200,000)
Short [Member] | Five and a Half Percent 30 Year TBA Securities [Member]
Cost basis	[1]	(277,696)
Market value	[3]	(278,996)
Net carrying value	[4]	(1,300)
Notional amount	[5]	(275,000)
Short [Member] | Six and a Half Percent 30-year TBA Securities [Member]
Cost basis	[1]	(161,103)
Market value	[3]	(161,127)
Net carrying value	[4]	(24)
Notional amount	[5]	(155,000)
Short [Member] | TBA Contracts [Member]
Cost basis	[1]	(189,107)	(124,332)
Market value	[3]	(189,937)	(119,961)
Net carrying value	[4]	(830)	4,371
Notional amount	[5]	180,000	150,000
Notional amount	[5]	$ (180,000)	$ (150,000)

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

[2] The Company has entered into offsetting long and short positions for these coupons.

[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.

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