Note 4 - Derivative and Other Hedging Instruments - Schedule of To Be Announced Securities (Details) - Short [Member] - USD ($) $ in Thousands		Jun. 30, 2023		Dec. 31, 2022
Five Percent TBA Securities [Member]
Notional amount		$ 100,000
Cost		99,234
Market value		99,351
Net carrying value		117
Notional Amount		(100,000)
Cost		99,234
Three Percent TBA Securities [Member]
Notional amount		350,000	[1]	$ 500,000
Cost		(308,494)	[2]	(440,644)
Market value		(308,410)	[3]	(440,274)
Net carrying value		84		370
Notional Amount		(350,000)	[1]	(500,000)
Cost		(308,494)	[2]	(440,644)
TBA Contracts [Member]
Notional amount		250,000		675,000
Cost		(209,260)		(582,912)
Market value		(209,059)		(583,419)
Net carrying value		201		(507)
Notional Amount		(250,000)		(675,000)
Cost		$ (209,260)		(582,912)
Two Percent TBA Contract [Member]
Notional amount				175,000
Cost				(142,268)
Market value				(143,145)
Net carrying value	[4]			(877)
Notional Amount				(175,000)
Cost				$ (142,268)

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

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

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

[4] 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