Note 7 - Offsetting Assets and Liabilities - Offsetting Assets (Details) - Assets [Member] - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Gross amount, recognized	$ 12,511	$ 6,420
Gross Amount, offset	0	0
Net Amount	12,511	6,420
Gross Amount, not recognized	0	0
Gross amount, not offset	(240)	0
Net amount, after deduction	12,271	6,420
Interest Rate Swap [Member]
Gross amount, recognized	11,252	6,348
Gross Amount, offset	0	0
Net Amount	11,252	6,348
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	11,252	6,348
Payer Swaptions [Member]
Gross amount, recognized	14	72
Gross Amount, offset	0	0
Net Amount	14	72
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	14	$ 72
Dual Digital Option [Member]
Gross amount, recognized	261
Gross Amount, offset	0
Net Amount	261
Gross Amount, not recognized	0
Gross amount, not offset	0
Net amount, after deduction	261
TBA Contracts [Member]
Gross amount, recognized	984
Gross Amount, offset	0
Net Amount	984
Gross Amount, not recognized	0
Gross amount, not offset	(240)
Net amount, after deduction	$ 744