Note 7 - Offsetting Assets and Liabilities - Offsetting Assets (Details) - Assets [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Gross amount, recognized	$ 6,420	$ 40,172
Gross Amount, offset	0	0
Net Amount	6,420	40,172
Gross Amount, not recognized	0	0
Gross amount, not offset	0	(13,021)
Net amount, after deduction	6,420	27,151
Interest Rate Swap [Member]
Gross amount, recognized	6,348	4,983
Gross Amount, offset	0	0
Net Amount	6,348	4,983
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	6,348	4,983
Payer Swaptions [Member]
Gross amount, recognized	72	33,398
Gross Amount, offset	0	0
Net Amount	72	33,398
Gross Amount, not recognized	0	0
Gross amount, not offset	0	(12,489)
Net amount, after deduction	$ 72	20,909
Interest Rate Cap [Member]
Gross amount, recognized		1,119
Gross Amount, offset		0
Net Amount		1,119
Gross Amount, not recognized		0
Gross amount, not offset		0
Net amount, after deduction		1,119
TBA Contracts [Member]
Gross amount, recognized		672
Gross Amount, offset		0
Net Amount		672
Gross Amount, not recognized		0
Gross amount, not offset		(532)
Net amount, after deduction		$ 140