Note 6 - Offsetting Assets and Liabilities - Offsetting Assets (Details) - Assets [Member] - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Gross amount, recognized	$ 52,324	$ 40,172
Gross Amount, offset	0	0
Net Amount	52,324	40,172
Gross Amount, not recognized	0	0
Gross amount, not offset	(2,369)	(13,021)
Net amount, after deduction	49,955	27,151
Interest Rate Swap [Member]
Gross amount, recognized	30,093	4,983
Gross Amount, offset	0	0
Net Amount	30,093	4,983
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	30,093	4,983
Payer Swaptions [Member]
Gross amount, recognized	17,957	33,398
Gross Amount, offset	0	0
Net Amount	17,957	33,398
Gross Amount, not recognized	0	0
Gross amount, not offset	(2,150)	(12,489)
Net amount, after deduction	15,807	20,909
Interest Rate Cap [Member]
Gross amount, recognized	211	1,119
Gross Amount, offset	0	0
Net Amount	211	1,119
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	211	1,119
Interest Rate Floor [Member]
Gross amount, recognized	3,844
Gross Amount, offset	0
Net Amount	3,844
Gross Amount, not recognized	0
Gross amount, not offset	0
Net amount, after deduction	3,844
TBA Contracts [Member]
Gross amount, recognized	219	672
Gross Amount, offset	0	0
Net Amount	219	672
Gross Amount, not recognized	0	0
Gross amount, not offset	(219)	(532)
Net amount, after deduction	$ 0	$ 140