Note 5 - Derivative and Other Hedging Instruments - Schedule of Derivative Instruments in Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Restricted Cash and Cash Equivalent, Current	$ 33,321	$ 25,723
TBA securities (including margin received on unsettled trades)	(1,471)	(5,395)
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative assets, at fair value	548	9,277
Derivative liabilities, at fair value	2,949	332
Total margin balances on derivative contracts	6,634	(1,377)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swap [Member]
Derivative assets, at fair value	0	4,574
Derivative liabilities, at fair value	2,267	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | TBA Contracts [Member]
Derivative assets, at fair value	548	4,703
Derivative liabilities, at fair value	682	332
Restricted Cash and Cash Equivalent, Current	530	280
TBA securities (including margin received on unsettled trades)	(330)	(4,282)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Eurodollar Future Margin [Member]
Restricted Cash and Cash Equivalent, Current	$ 6,434	$ 2,625