Note 5 - Derivative and Other Hedging Instruments - Schedule of Derivative Instruments in Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Restricted Cash and Cash Equivalents, Current	$ 11,612	$ 28,396
Other liabilities	(2,585)	(1,031)
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative assets, at fair value	16,846	6,420
Derivative liabilities, at fair value	0	12,694
Total margin balances on derivative contracts	847	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	14,678	6,348
Not Designated as Hedging Instrument, Economic Hedge [Member] | TBA Contracts [Member]
Derivative assets, at fair value	2,168	0
Derivative liabilities, at fair value	0	12,694
Restricted Cash and Cash Equivalents, Current	0	23,720
Other liabilities	(1,593)	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Eurodollar Future Margin [Member]
Restricted Cash and Cash Equivalents, Current	2,440	4,096
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swaption [Member]
Restricted Cash and Cash Equivalents, Current	$ 0	$ 580