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

3 Months Ended

Mar. 31, 2023

Notes Tables

Marketable Securities [Table Text Block]

(in thousands)
	March 31, 2023		December 31, 2022
Pass-Through RMBS Certificates:
Fixed-rate Mortgages	$	3,980,462	$	3,519,906
Total Pass-Through Certificates		3,980,462		3,519,906
Structured RMBS Certificates:
Interest-Only Securities		18,962		19,669
Inverse Interest-Only Securities		482		427
Total Structured RMBS Certificates		19,444		20,096
Total	$	3,999,906	$	3,540,002

Gain (Loss) on Securities [Table Text Block]

	Three Months Ended March 31,
	2023		2022
Proceeds from sales of RMBS	$	-	$	1,413,039
Carrying value of RMBS sold		-		(1,464,125	)
Net loss on sales of RMBS	$	-	$	(51,086	)
Gross gain on sales of RMBS	$	-	$	709
Gross loss on sales of RMBS		-		(51,795	)
Net loss on sales of RMBS	$	-	$	(51,086	)