Note 9 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreements to Repurchase (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Outstanding balance at end of period	$ 149,852		$ 149,852		$ 152,991
Average outstanding balance during the period	$ 156,865	$ 127,063	$ 156,392	$ 120,740
Weighted average interest rate at end of period	2.08%		2.08%		2.23%
Average interest rate during the period	2.38%	1.86%	2.25%	1.58%
Maximum outstanding at any month end during the period	$ 175,211	$ 127,931	$ 179,428	$ 138,347