Note 7 - Offsetting Assets and Liabilities - Offsetting Assets (Details) - Assets [Member] - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Gross amount, recognized	$ 361,749	$ 137,865
Gross Amount, offset	0	0
Net Amount	361,749	137,865
Gross Amount, not recognized	(358,740)	(128,613)
Gross amount, not offset	(337)	(360)
Net amount, after deduction	2,672	8,892
Interest Rate Swap [Member]
Gross amount, recognized	2,628	8,237
Gross Amount, offset	0	0
Net Amount	2,628	8,237
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	2,628	8,237
TBA Contracts [Member]
Gross amount, recognized	381	1,015
Gross Amount, offset	0	0
Net Amount	381	1,015
Gross Amount, not recognized	0	0
Gross amount, not offset	(337)	(360)
Net amount, after deduction	44	655
Reverse Repurchase Agreement [Member]
Gross amount, recognized	358,740	128,613
Gross Amount, offset	0	0
Net Amount	358,740	128,613
Gross Amount, not recognized	(358,740)	(128,613)
Gross amount, not offset	0	0
Net amount, after deduction	$ 0	$ 0