Note 5 - Derivative and Other Hedging Instruments - Schedule of Derivative Instruments in Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Restricted Cash and Cash Equivalents, Current	$ 25,723	$ 28,396
Other liabilities	(5,395)	(1,031)
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative assets, at fair value	9,277	6,420
Derivative liabilities, at fair value	332	12,694
Total margin balances on derivative contracts	(1,377)	28,396
Not Designated as Hedging Instrument, Economic Hedge [Member] | Long [Member]
Derivative assets, at fair value	0	72
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swap [Member]
Derivative assets, at fair value	4,574	6,348
Not Designated as Hedging Instrument, Economic Hedge [Member] | TBA Contracts [Member]
Derivative assets, at fair value	4,703	0
Derivative liabilities, at fair value	332	12,694
Restricted Cash and Cash Equivalents, Current	280	23,720
Other liabilities	(4,282)	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Eurodollar Future Margin [Member]
Restricted Cash and Cash Equivalents, Current	2,625	4,096
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swaption [Member]
Restricted Cash and Cash Equivalents, Current	$ 0	$ 580