Note 4 - Repurchase Agreements - Schedule of Repurchase Agreements (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair value of securities pledged, including accrued interest receivable	$ 15,943	$ 89,220
Repurchase agreement liabilities associated with these securities	$ 15,033	$ 85,326
Net weighted average borrowing rate	3.76%	3.98%
Maturity Overnight [Member]
Fair value of securities pledged, including accrued interest receivable	$ 0	$ 0
Repurchase agreement liabilities associated with these securities	$ 0	$ 0
Net weighted average borrowing rate	0.00%	0.00%
Maturity Less than 30 Days [Member]
Fair value of securities pledged, including accrued interest receivable	$ 14,118	$ 70,681
Repurchase agreement liabilities associated with these securities	$ 13,282	$ 67,669
Net weighted average borrowing rate	3.76%	4.00%
Maturity 30 to 90 Days [Member]
Fair value of securities pledged, including accrued interest receivable	$ 1,825	$ 18,539
Repurchase agreement liabilities associated with these securities	$ 1,751	$ 17,657
Net weighted average borrowing rate	3.77%	3.89%
Maturity Greater than 90 Days [Member]
Fair value of securities pledged, including accrued interest receivable	$ 0	$ 0
Repurchase agreement liabilities associated with these securities	$ 0	$ 0
Net weighted average borrowing rate	0.00%	0.00%