Note 4 - Derivative and Other Hedging Instruments - Schedule of To Be Announced Securities (Details) - Short [Member] - USD ($) $ in Thousands	Mar. 31, 2023		Dec. 31, 2022
Two Percent TBA Contract [Member]
Notional amount	$ (175,000)		$ (175,000)
Cost	(144,511)		(142,268)
Market value	(144,526)		(143,145)
Net carrying value	(15)	[1]	(877)
Cost	(144,511)		(142,268)
Market value	(144,526)		(143,145)
Three Percent TBA Securities [Member]
Notional amount	(700,000)	[2]	(500,000)
Cost	(616,438)	[3]	(440,644)
Market value	(627,457)	[4]	(440,274)
Net carrying value	(11,019)		370
Cost	(616,438)	[3]	(440,644)
Market value	(627,457)	[4]	(440,274)
TBA Contracts [Member]
Notional amount	(875,000)		(675,000)
Cost	(760,949)		(582,912)
Market value	(771,983)		(583,419)
Net carrying value	(11,034)		(507)
Cost	(760,949)		(582,912)
Market value	$ (771,983)		$ (583,419)

[1] Net carrying value represents the difference between the market value and the cost basis of the TBA securities as of period-end and is reported in derivative assets (liabilities), at fair value in our balance sheets

[2] Notional amount represents the par value (or principal balance) of the underlying Agency RMBS.

[3] Cost basis represents the forward price to be paid (received) for the underlying Agency RMBS.

[4] Market value represents the current market value of the TBA securities (or of the underlying Agency RMBS) as of period-end.