Note 4 - Repurchase Agreements - Schedule of Repurchase Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Fair value of securities pledged, including accrued interest receivable	$ 121,390	$ 122,692
Repurchase agreement liabilities associated with these securities	$ 115,511	$ 117,181
Net weighted average borrowing rate	4.47%	4.68%
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	$ 56,482	$ 84,954
Repurchase agreement liabilities associated with these securities	$ 53,802	$ 81,215
Net weighted average borrowing rate	4.45%	4.70%
Maturity 30 to 90 Days [Member]
Fair value of securities pledged, including accrued interest receivable	$ 64,908	$ 17,675
Repurchase agreement liabilities associated with these securities	$ 61,709	$ 16,855
Net weighted average borrowing rate	4.48%	4.54%
Maturity Greater than 90 Days [Member]
Fair value of securities pledged, including accrued interest receivable	$ 0	$ 20,063
Repurchase agreement liabilities associated with these securities	$ 0	$ 19,111
Net weighted average borrowing rate	0.00%	4.76%