Note 5 - Derivative and Other Hedging Instruments - Schedule of Derivative Instruments in Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Restricted Cash and Cash Equivalents, Current	$ 13,247	$ 28,396
Other liabilites	(917)	(1,031)
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative assets, at fair value	12,511	6,420
Derivative liabilities, at fair value	80	12,694
Total margin balances on derivative contracts	5,589	28,396
Not Designated as Hedging Instrument, Economic Hedge [Member] | Long [Member]
Derivative assets, at fair value	14	72
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swap [Member]
Derivative assets, at fair value	11,252	6,348
Not Designated as Hedging Instrument, Economic Hedge [Member] | Dual Digital Option [Member]
Derivative assets, at fair value	261	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | TBA Contracts [Member]
Derivative assets, at fair value	984	0
Derivative liabilities, at fair value	80	12,694
Restricted Cash and Cash Equivalents, Current	65	23,720
Other liabilites	(240)	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Eurodollar Future Margin [Member]
Restricted Cash and Cash Equivalents, Current	5,009	4,096
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swaption [Member]
Restricted Cash and Cash Equivalents, Current	$ 755	$ 580