Note 2 - Mortgage-backed Securities and U.S. Treasury Notes (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Marketable Securities [Table Text Block]

(in thousands)
	June 30, 2023		December 31, 2022
Pass-Through RMBS Certificates:
Fixed-rate Mortgages	$	4,356,203	$	3,519,906
Total Pass-Through Certificates		4,356,203		3,519,906
Structured RMBS Certificates:
Interest-Only Securities		17,448		19,669
Inverse Interest-Only Securities		321		427
Total Structured RMBS Certificates		17,769		20,096
Total	$	4,373,972	$	3,540,002

Gain (Loss) on Securities [Table Text Block]

	Six Months Ended June 30,
	2023		2022
Proceeds from sales of RMBS	$	-	$	1,934,606
Carrying value of RMBS sold		-		(2,001,135	)
Net loss on sales of RMBS	$	-	$	(66,529	)
Gross gain on sales of RMBS	$	-	$	2,705
Gross loss on sales of RMBS		-		(69,234	)
Net loss on sales of RMBS	$	-	$	(66,529	)