Note 4 - Derivative and Other Hedging Instruments - Schedule of To Be Announced Securities (Details) - Short [Member] - USD ($) $ in Thousands		Dec. 31, 2022		Dec. 31, 2021
Two Percent TBA Contract [Member]
Notional amount		$ (175,000)
Cost basis		(142,268)
Market value		(143,145)
Net carrying value	[1]	(877)
Cost		(142,268)
Market value		(143,145)
Three Percent TBA Securities [Member]
Notional amount		(500,000)	[2]	$ (575,000)
Cost basis		(440,644)	[3]	(595,630)
Market value		(440,274)	[4]	(595,934)
Net carrying value		370		(304)
Cost		(440,644)	[3]	(595,630)
Market value		(440,274)	[4]	(595,934)
TBA Contracts [Member]
Notional amount		(675,000)		(575,000)
Cost basis		(582,912)		(595,630)
Market value		(583,419)		(595,934)
Net carrying value		(507)		(304)
Cost		(582,912)		(595,630)
Market value		$ (583,419)		$ (595,934)

[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.