Note 5 - Derivative and Other Hedging Instruments - Schedule of To Be Announced Securities (Details) - USD ($) $ in Thousands		Mar. 31, 2026		Dec. 31, 2025
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
Market value	[2],[3]			0
Notional amount	[2],[5]			0
Four Percent 30-year TBA Securities [Member]
Cost basis				(215)
Market value	[3]			0
Net carrying value	[4]			215
Notional amount				0
Market value	[3]			0
Notional amount				0
Long [Member] | Four and a Half Percent 15-year TBA Securities [Member]
Notional amount		$ 250,000	[5]	250,000
Cost basis		248,506	[1]	249,998
Market value	[3]	247,871		250,186
Net carrying value	[4]	(635)		188
Market value	[3]	247,871		250,186
Long [Member] | TBA Contracts [Member]
Cost basis		87,911
Market value	[3]	87,657
Net carrying value	[4]	(254)
Notional amount		95,000
Market value	[3]	87,657
Notional amount		(95,000)
Long [Member] | Five Percent 15 Year TBA Securities [Member]
Cost basis	[1]			218
Market value	[3]			0
Net carrying value	[4]			(218)
Notional amount	[5]			0
Market value	[3]			0
Notional amount	[5]			0
Short [Member] | Six and a Half Percent 30-year TBA Securities [Member]
Cost basis		(160,595)	[1]	(161,103)
Market value	[3]	(160,214)		(161,127)
Net carrying value	[4]	381		(24)
Notional amount		(155,000)	[5]	(155,000)
Market value	[3]	$ (160,214)		(161,127)
Short [Member] | TBA Contracts [Member]
Cost basis	[1]			(189,107)
Market value	[3]			(189,937)
Net carrying value	[4]			(830)
Notional amount	[5]			180,000
Market value	[3]			(189,937)
Notional amount	[5]			(180,000)
Short [Member] | Three Percent 30 Year TBA Securities [Member]
Cost basis	[1]			(343)
Market value	[3]			0
Net carrying value	[4]			343
Notional amount	[5]			0
Market value	[3]			0
Notional amount	[5]			0
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)
Market value	[3]			$ (278,996)

[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.