Note 7 - Offsetting Assets and Liabilities - Offsetting Assets (Details) - Assets [Member] - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Gross amount, recognized	$ 20,605	$ 40,172
Gross Amount, offset	0	0
Net Amount	20,605	40,172
Gross Amount, not recognized	0	0
Gross amount, not offset	(10,634)	(13,021)
Net amount, after deduction	9,971	27,151
Interest Rate Swap [Member]
Gross amount, recognized	5,286	4,983
Gross Amount, offset	0	0
Net Amount	5,286	4,983
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	5,286	4,983
Payer Swaptions [Member]
Gross amount, recognized	1,418	33,398
Gross Amount, offset	0	0
Net Amount	1,418	33,398
Gross Amount, not recognized	0	0
Gross amount, not offset	(1,418)	(12,489)
Net amount, after deduction	0	20,909
Interest Rate Cap [Member]
Gross amount, recognized	704	1,119
Gross Amount, offset	0	0
Net Amount	704	1,119
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	704	1,119
Interest Rate Floor [Member]
Gross amount, recognized	3,981
Gross Amount, offset	0
Net Amount	3,981
Gross Amount, not recognized	0
Gross amount, not offset	0
Net amount, after deduction	3,981
TBA Contracts [Member]
Gross amount, recognized	9,216	672
Gross Amount, offset	0	0
Net Amount	9,216	672
Gross Amount, not recognized	0	0
Gross amount, not offset	(9,216)	(532)
Net amount, after deduction	$ 0	$ 140