Note 7 - Offsetting Assets and Liabilities - Offsetting Liabilities (Details) - Liability [Member] - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Gross amount, recognized	$ 10,117,312	$ 5,025,875
Gross Amount, offset	0	0
Net Amount	10,117,312	5,025,875
Gross Amount, not recognized	(10,064,295)	(5,002,725)
Gross amount, not offset	(53,017)	(23,098)
Net amount, after deduction	0	52
Repurchase Agreements [Member]
Gross amount, recognized	10,115,466	5,025,543
Gross Amount, offset	0	0
Net Amount	10,115,466	5,025,543
Gross Amount, not recognized	(10,064,295)	(5,002,725)
Gross amount, not offset	(51,171)	(22,818)
Net amount, after deduction	0	0
TBA Contracts [Member]
Gross amount, recognized	1,846	332
Gross Amount, offset	0	0
Net Amount	1,846	332
Gross Amount, not recognized	0	0
Gross amount, not offset	(1,846)	(280)
Net amount, after deduction	$ 0	$ 52