Note 6 - Offsetting Assets and Liabilities - Offsetting Assets (Details) - Assets [Member] - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Gross amount recognized	$ 40,172	$ 50,786
Gross amount offset in the balance sheet	0	0
Net amount presented in the balance sheet	40,172	50,786
Gross amount not offset in the balance sheet, financial instruments posted as collateral	0	0
Gross amount not offset in the balance sheet, cash posted as collateral	(13,021)	(6,350)
Net amount	27,151	44,436
Interest Rate Swap [Member]
Gross amount recognized	4,983	29,293
Gross amount offset in the balance sheet	0	0
Net amount presented in the balance sheet	4,983	29,293
Gross amount not offset in the balance sheet, financial instruments posted as collateral	0	0
Gross amount not offset in the balance sheet, cash posted as collateral	0	0
Net amount	4,983	29,293
Payer Swaptions [Member]
Gross amount recognized	33,398	21,493
Gross amount offset in the balance sheet	0	0
Net amount presented in the balance sheet	33,398	21,493
Gross amount not offset in the balance sheet, financial instruments posted as collateral	0	0
Gross amount not offset in the balance sheet, cash posted as collateral	(12,489)	(6,350)
Net amount	20,909	15,143
Interest Rate Cap [Member]
Gross amount recognized	1,119
Gross amount offset in the balance sheet	0
Net amount presented in the balance sheet	1,119
Gross amount not offset in the balance sheet, financial instruments posted as collateral	0
Gross amount not offset in the balance sheet, cash posted as collateral	0
Net amount	1,119
TBA Contracts [Member]
Gross amount recognized	672	0
Gross amount offset in the balance sheet	0	0
Net amount presented in the balance sheet	672	0
Gross amount not offset in the balance sheet, financial instruments posted as collateral	0	0
Gross amount not offset in the balance sheet, cash posted as collateral	(532)	0
Net amount	$ 140	$ 0