Note 5 - Derivative and Other Hedging Instruments - Schedule of Derivative Instruments in Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Restricted Cash and Cash Equivalent, Current	$ 86,114	$ 58,696
TBA securities (including margin received on unsettled trades)	(1,148)	(1,567)
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative assets, at fair value	3,009	9,253
Derivative liabilities, at fair value	635	1,846
Total margin balances on derivative contracts	3,165	7,165
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swap [Member]
Derivative assets, at fair value	2,628	8,238
Not Designated as Hedging Instrument, Economic Hedge [Member] | TBA Contracts [Member]
Derivative assets, at fair value	381	1,015
Derivative liabilities, at fair value	635	1,846
Restricted Cash and Cash Equivalent, Current	1,090	2,394
TBA securities (including margin received on unsettled trades)	(337)	(360)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Eurodollar Future Margin [Member]
Restricted Cash and Cash Equivalent, Current	$ 2,412	$ 5,131